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283 Assembly

3K views 21 replies 8 participants last post by  Mertz 
#1 ·
I am putting together my 65 283 after doing the machining in my class and having the final honing and balancing done by my instructor. I have the crank, pistons and cam installed. I will have the oil pump and fuel pump installed in the next few days along with the timing chain.

I have been reading up on what break in oil to use and my instructor recommended Joe Gibbs BR which I can get locally. I have the bearings and the cam coated with moly graphite assembly lube. I want to get the heads on the valve lashed but I have read that I should not pump up the lifters. I was going to prime the pump and the engine before installing the intake manifold. On a video I have the guy primed the engine before he put on the heads and push rods. He kept pumping until no more bubbles came out of the lifters. Isn't that pumping up the lifters? Also by priming the engine am I going to be wiping of the assembly lube off the cam lobes and bearings? I won't be starting the engine for some time but I want to get it ready as much as possible.

Do you have any recommendations how far I should take this before covering it up?
 
#3 · (Edited)
I have always used Crane 99004-1 Super Moly-disulfide paste on flat tappet cam lobes and distributor drive and driven gears. I have never had a cam go flat during the break in period and I used valve springs on different engines that had from 110-125 lb. seat and from 300-320 lb. open pressure. I crossed my fingers during the break in period on each engine. That was with Valvoline Racing oil that still had high zinc -phosphorus additives.

My present engine has hydraulic roller lifters and assembled it with Valvoline 10W-30 All Season with a bottle of GM Engine Oil Supplement (EOS) on the cam lobes, lifters and bearings. I assembled the engine with Crane Super Moly-disulfide paste on the distributor drive and driven gears only. We installed, primed and broke-in the engine within a week after it was assembled. The valve springs were set up with 144 lb. seat and 330 open pressure.
 
#5 ·
I use assembly lube on everything, and the cam mfg's lube on the cam. I think the Joe Gibbs oil is a good one. Never used it, but I've heard good. I use Brad Penn 30 wt breakin oil and Brad Penn 20-40 wt. oil after they are broke in.
I always prime my engines with the whole engine assembled, and just the valve covers off.
 
#6 ·
Use a moly lube on the cam and lifters, I wouldn't let the engine sit for months un-run, at least put it on a test stand and run it in for half an hour at a 2000 RPM to get through the initial cam break in.

The problem with pumping up the lifters is just that, you can fill the gap between the plunger and inside bottom of the body to the point where the plunger is now pressed against the retainer clip on the top of the lifter body, you can see this. That means that you have to adjust the rocker just to where there is no lash in the push rod (((BUT))) I really want your attention!!! There can be NO adjustment made past that point (the instructions tell you to take up the lash and tighten the nut 1/2 maybe 3/4 additional turn) NO not if you pumped the lifter up. If you go beyond zero lash without the engine running there is no way for the lifter to bleed the oil that has the plunger and body hydraulically locked at their internal base clearance. Attempting to push into this zone risks bending the push rod or damaging the check valve or maybe even blowing out the bottoms of the plunger and/or the lifter body. This would be most similar to the kind of damage that can happen when you run a bolt into a blind hole that has a pool of oil at its base.

So if you know the lifters are pumped up and make a correction for that when you take up the lash just to zero or a little looser you're OK, but you then have to wait to make the final adjustment of 1/2 to 3/4 turn in beyond zero lash till the engine is running so the check valve in the lifter will be cycling and hydraulic lock up will be avoided.

When you don't pump up a new lifter (assume previously run lifters to be pumped up and treat them to no more adjustment than zero lash) when you otherwise go to zero lash with a dry lifter and then add 1/2 to 3/4 turn it sets the running clearance but the plunger is being held up from its bottom seat by a spring so it will always feel mushy if you really crank on the rocker or push rod you will feel this while making your first adjustment. This is OK! When the engine is prelubed with the valve springs pushing on the plunger the cavity under plunger will only fill to the space limit that exists depending on whether the lifter is on the heel or on a lobe. Any movement after you initially set the lash adjustment, which is done with each lifter on the heel of its cam lobe, once you rotate the still un-oil-pressurized lifter the plunger will set down onto a seat in the bottom of the body as the valve spring pushes it down and it will only fill with as much oil when pre-lubing without rotation of the crank as there is space under the seated plunger, therefore, it will not hydraulically lock. Rotating the engine cycles the lifter through the force of the valve spring this will exercise the check valve and it will fill the clearance chamber to raise the plunger till it feels valve spring pressure. This should then keep the push rod cup at the number of nut turns as that translates into clearance dimension. Given a fine threaded 3/8's bolt has 24 threads to the inch turning down 1/2 turn beyond zero lash will give a running clearance to the retainer of .0208 inch to a 3/4 turn of .0308 inch. If the lifter bleeds down to fast it won't hold this and it will tick, if it pumps up because its chasing lash added by "valve float" it will hold the valve off the seat by this amount.

Bogie
 
#7 ·
Roller Camshafts:
The Comp Cams austempered ductile iron hydraulic roller camshafts are not parkerized. The ductile iron hydraulic roller camshaft are only coated with a corrosion inhibitor which should be washed off with a solvent before the camshaft is installed. The hydraulic roller camshaft lobes and engine bearings should only be lubed with motor oil containing GM 88862587 EOS or Permatex 81950. Electromagnetic parkerization is not required on ductile iron hydraulic roller camshafts and it cannot be used on high nickle-steel billet solid roller camshafts.

Flat tappet camshafts:
Parkerization is a zinc-phosphate electromagnetic conversion treatment that is only used on flat tappet camshafts in order to prevent corrosion during storage. Parkerization also effective at absorbing moly-disulfide lubricant until the engine can be started and the camshaft broke-in.
 
#8 ·
I think I got on the lifters. If they are pumped up as in an already running engine go to zero lash and no more. For dry lifters it is ok to go to zero an then add the 1/2 to 3/4 turn. They will then fill with the appropriate amount of oil without damaging any thing.

With that new knowledge, I set the lash on my 350 in my Chevy pickup to zero and then 1/2 turn. Should I go back a set it to zero and leave it? I don't have any bent push rods and it runs fine but not all that much power.

BTW Thanks for the information It is always good to get information like this that I have never read anywhere else. They don't tell you the correct method with the cam instructions. All I have ever heard was zero than zero to 1 1/2 turns.
 
#9 ·
I just tried to install my Cloyes roller timing chain. I have the sprocket on the crank and the #1 piston at TDC but the align marks won't line up. I have a chain set up that can be installed retarded, OE or advanced and it does not have a dot on the crank sprocket. The dot on the cam sprocket is to one side of center. If I move a tooth it goes to the other side but much farther of center. Is this going to be a problem? I wouldn't mind a little retarded for more low end torque but I would prefer it was straight up.
 
#10 · (Edited)
First off, you advance the camshaft in relation to the crankshaft to generate more low end and low mid range. (You secure the crankshaft to prevent it turning and then turn the cam sprocket, with the cam attached to the sprocket, clockwise to advance the camshaft relative to the crankshaft). Leaving the crank still and the cam still and turning only the cam sprocket clockwise, using offset dowels, will retard the cam timing in relation to the crankshaft. Leaving the crank still and the camshaft still and turning only the cam sprocket counter-clockwise, using offset dowels, will advance the camshaft in relation to the crankshaft. Retarding it will improve top end and upper mid range at the expense of low end and low mid range power. Pull the crank sprocket off and see if the mark is on the other side. If you're seeing a chamfer at the edge of the bore of the sprocket, it's definitely on backwards. That chamfer goes to the fillet radius on the crank.

For the rest of you....
#1 cylinder and #6 cylinders are companion cylinders. They both come to TDC at the same time. When assembling a motor, line up the dot on the cam sprocket at 6PM and the dot on the crank sprocket at 12PM, so that they are right next to each other. With the cam in this position, #6 cylinder will be ready to fire. In order to get #1 cylinder ready to fire (so that you can run the distributor wiring correctly), you will want to turn the crankshaft one complete turn clockwise, so that the cam dot is at 12PM and the crank dot is at 12PM.
 
#11 · (Edited)
The crankshaft sprocket has three notches. There is one that is square on the top that is supposed to retard timing. One round on the top that is OEM and one that has a point on top of the notch that is for advanced. The instructions say that it will advance or retard 2 degrees using the either the retard or advance notch.

So when I set the number 1 to TDC number 6 should also be to TDC. If I am 180 out does number 6 not show up at TDC? I am installing the cam sprocket with number 1 at TDC is that correct? The cam dot is at 6 and since there is no crank dot I have it set for TDC. I will slip on the balancer and see if it puts the timing mark at TDC since it has to go over the same key.

Sorry for being confused this is my first build and I want to get it right.

I just went out and checked and the sprocket is on right and I did check to see if either side had a dot before I put it on and they did not. I figured no dot since it can be put on three ways. The instructions do however show a dot. I installed it square to retarded on the left and advance pointed top on the right.
 
#13 ·
The crankshaft sprocket has three notches. There is one that is square on the top that is supposed to retard timing. One round on the top that is OEM and one that has a point on top of the notch that is for advanced. The instructions say that it will advance or retard 2 degrees using the either the retard or advance notch.

So when I set the number 1 to TDC number 6 should also be to TDC. If I am 180 out does number 6 not show up at TDC? I am installing the cam sprocket with number 1 at TDC is that correct? The cam dot is at 6 and since there is no crank dot I have it set for TDC. I will slip on the balancer and see if it puts the timing mark at TDC since it has to go over the same key.

Sorry for being confused this is my first build and I want to get it right.
No problem, we'll keep doin' it until everyone understands it. Stop worrying about the position of any of the pistons in their bores. It doesn't matter for installing the sprockets. Just put the dots together and bolt the sprocket and chain on the motor. Use whichever dot you want to on the crank sprocket, but be advised that the cam is already ground in an advance position from the factory. All the cam grinders do that automatically. I would advise installing the cam on the zero mark and running the motor. Then, if you decide you need more bottom, advance the cam or install another grind that closes the intake earlier.

Again, don't worry about where any of the pistons are. The crank gear will only go on one way because of the key and the cam gear will only go on one way if you align the dots right next to each other. Once you have the crank gear on at 12PM and the cam gear on at 6PM and have the whole mess buttoned up, rotate the crankshaft one complete revolution clockwise so that you will then be ready to drop the distributor in and run the plug wires.

#6 and #1 are companion cylinders. The piston comes to the top of the bore on both of them at the same time. The difference is that when you have the crank gear at 12PM and the cam gear at 6PM, #6 is ready to fire and #1 is on overlap. Having the crank gear at 12PM and the cam gear at 12PM will put #1 at firing position and #6 at overlap. That's how you want it to run the wiring.
 
#14 ·
One note about pumped up lifters. They are pumped up after the engine runs, right? If they would cause damage if you adjusted them when pumped up, then the valves could never be readjusted after the engine ran the first time.

This isn't the case, because the lifter bleeds down from the pressure of the valve spring. If you doubt this, zero lash a pumped up lifter w/the lifter on the base circle of the cam. Add a turn of preload to it and feel how tight the rocker arm is. Go have a Coke. Come back and see if the rocker arm is still as tight as it was right after adding preload.

BTW, I'm the one guy left in the world who still pumps up his hydraulic lifters in a can of oil. I have my reasons for doing this, it's not out of ignorance. I have done this for around 40 years. Just saying.
 
#17 · (Edited)
You have three key slots on the crank gear. Usually the the key on the left has a square retards the timing. The key on the right with triangle advances the timing. The center key with the dot is straight up 0 degree advance. If the gear is not marked I would take it back and get another one that has the markings. If you installed it with the center key, when you install the timing cover and the balancer the line on the balancer should be on 0 on the scale.
 
#19 ·
What an idiot I turned out to be!!!!!! Installed the gear just like it showed on the instructions with the square side to the left because I could not find a dot on either side. I went online to look for better instructions and found out there is not supposed to be a dot. If you use the square key way you look for a square mark, the round keyway a round mark and the triangle keyway a triangle mark. As it turns out I did have the gear on backwards. I took my magnifying glass and found the triangle mark on the back of the gear. After some persuasion I got the gear off and flipped it over. I got the O mark aligned with the dot on the cam gear. As it turns out the #1 piston is in the same spot as it was when I had the gear backwards. I feel a lot better about the alignment now.

Thanks for putting up with me on this.
 
#22 ·
Thanks guys. It is a lot of fun to learn about all this stuff. I once owned a restored 67 Malibu SS and although it was one of my dream cars it wasn't that much fun because there was nothing for me to do and figure out how to fix.

I worked in a "service station" in high school where we actually did some mechanical work and it was what i really liked over pumping gas for people that came in and wanted "2 buckets worth". Gas was 25 cents and that would give you about a half a tank, enough to go crusin for the night and then some.

I sometimes tell my wife that I am disappointed because I haven't turned a wrench for 6 months. Fly fishing does fill that hole partially but not completely.

This is a great website. I can see how many more people are signing in since I started. Sometime over 1000 people looking. Thanks to all the people who organized the site and keep it running. There is a lot of knowledge here that can be shared by a lot of enthusiast.
 
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