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Topic Review (Newest First)
11-11-2009 06:47 PM
Gun Laker What I understand is that all the oil comes to the bearing groove from an annulus and with the bearing in the right spot, only some oil goes to the bearing, the rest gets diverted to the lifter galleries. If the bearing is not in place, all the oil dumps at the bearing so little oil get diverted to the the lifter galleries. Does that make any sense?
11-11-2009 03:17 PM
cobalt327 Click thumbnail for a better view:
11-11-2009 01:40 PM
k-star
bearing

Yep thats the problem, not installed deep enough.


Keith
11-11-2009 01:15 PM
Gun Laker OK, I pulled the engine and took it all apart to get to the cam bearings. Many people asked if the bearings for the cam were install correctly. Having them installed incorrectly may have caused not getting enough oil to the top of the engine. The rear cam bearing shown in the attached picture looks like it did not get installed back far enough. I think the groove that the hole in the bearing is supposed to line up over is still back further. The other bearings look OK. The middle three I can see down through the hole in the main bearing through to the where the cam would be. The front bearing is lined up with a feed tube and the groove can be felt with a straightened paper clip. Any thoughts, is the rear bearing set wrong?
10-30-2009 06:31 PM
Gun Laker
Quote:
Originally Posted by k-star
Go back and ready my post #14.

You said you checked the bearing clearance but never a gave the sizes.

IMO the thing needs to come out and apart before you really hurt something.

I guess my last statement in that post is still true......


Keith
I guess I am at that point. Time to start over and triple check everything. At least I am learning more than I thought I would and after all it's just a matter of some more time and some more money. That' life right? Thanks for everyone's help. I will let you know what I find out.
10-30-2009 05:37 AM
k-star
oil

Go back and ready my post #14.

You said you checked the bearing clearance but never a gave the sizes.

IMO the thing needs to come out and apart before you really hurt something.

I guess my last statement in that post is still true......


Keith
10-29-2009 07:06 PM
Gun Laker OK, I put in a standard oil pump, set the pick up at about 1/4 of an inch from the bottom, put in 10W-40 oil and primed the engine and got about 50 psi on the gauge in the car and about 30 on the mechanical gauge hooked in near the distributor. Ran the engine in the garage and the lifters were noisy, but quieted down quick and all sounded good. Pressure in the car was 40 or higher at 2000 RPM and 20+ on the mechanical. I drove the car tonight and it went well until about a mile down the road, the lifters were very noisy. I turned around and went back. The pressure in the car never went below 40 at a cruise of about 35 MPH, but the lifters were very noisy and the pressure at the top was maybe around 5 at idle and 20 in the car. What's next as I am thinking it must be I got the wrong bearings or something. I am perplexed. Suggestions?
10-25-2009 09:25 PM
Short_box Im having the same issue. I have a 350 bore 60 over .510 lift cam vic jr +1 intake holly 750 double pump nothing special with maybe 35 miles on it and since day one when i did my cam brake in its had bout 30psi on cold start up, 50psi at cruising speed, and once warmed up at idle my guage will hit 0 but still oil coming out my pushrods/rockers. Ive got 2500 invested in just the short block parts and labor to put it together and im not trying to have it go to **** and the guy who built it dont have an idea why its doing that wich has me worried even more. I dont believe the high volume pump will work cuz i was told it was a high volume low pressure pump. Im no engine builder i can tune but cant build so a lil more help on those plugs some guys have mentioned would help me out alot. Thanks for everyones time.
Matt
10-21-2009 06:28 PM
cobalt327
Quote:
Originally Posted by Gun Laker
Some people thought that a high volume oil pump with a standard pan might be cause me some pick up issues.
I can see how that could play out- the high volume pump will tend to keep the oil level somewhat lower in the pan in the first place. That- with the pickup being too high in the first place- could be all it would take.

A standard volume pump isn't a step down- likely it is just what your engine really needs, anyway.

Good luck.
10-21-2009 04:49 PM
Gun Laker I pulled the oil pan and the the pick up seemed a bit high. Some people thought that a high volume oil pump with a standard pan might be cause me some pick up issues. So I will put a standard volume and use some heavier oil before taking the next step. I will also spot weld the pick up and prevent any movement that may have occurred. I had 5w-30 oil in the engine so I will go up a few and retry. Thanks for the continued feedback!
10-21-2009 01:32 PM
lg1969 Gun Laker, I the exact problem on my I was rebuilding my 307. It turn out the distributor housing did not sealed properly were the oil passes around to the lifter gallery. If was you I would replace the distributor. If that does not work, you have to pull the engine out. Put it on a engine stand, drop the oil pan, use a small can full of oil put it on the pickup then turn the pump the gutted distributor or distributor primer pump, with a hand drill and see where the oil is escaping. Hope this help you.
10-21-2009 10:19 AM
Gun Laker OK, this morning I pulled off the front timing cover and all three of the plugs were in place. Nothing else looked odd either. So now I will pull the oil pan and see what's up in there. I will let you know what I find. Wish me luck!
10-21-2009 10:16 AM
k-star
Quote:
Originally Posted by GMC boogie
Yes,would be pretty obvious on the first four,not so on the rear cam bearing...seen it before due to careless installation. Groove barely exposed but enough to leak.....was not that obvious due to the depth of the bore back there.

You are correct, if they stopped the rear cam bearing flush with the block I could see the groove being exposed. It would be rare, but I could see it happening.


But i would think soon as you installed the cam and the rear journal dissappeared into the bearing it would be a big red flag.

I guess some assemblers just don't look for stuff like that.

Plus i don't think that issue would change with oil temp. If that rear groove was out the pressure should be low all the time not just at temp.

Keith
10-21-2009 08:33 AM
GMC boogie
Quote:
Originally Posted by k-star

It is not the cam bearings. In order to expose the groove in a chevy that bearing would need to be 1/2 ways out the bore. It would have stuck out like a sore thumb when you were putting it together.





Keith
Yes,would be pretty obvious on the first four,not so on the rear cam bearing...seen it before due to careless installation. Groove barely exposed but enough to leak.....was not that obvious due to the depth of the bore back there.
10-21-2009 07:37 AM
Gun Laker
Quote:
Originally Posted by engineczar
Did you get the one under the rear main cap?
Yes, but I will double check if I have to pull the oil pan
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