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27Tall T 12-05-2012 06:55 PM

Don't answer the phone!
 
:welcome:Just when I thought I had it all figured out this happened. I have a rebuilt 327 sbc that has not as yet been run. I should have set the valves and timing before installing it into the car, but oh well. Found TDC and adjusted the valves in the proper sequence and then set the distributor according to #1. Primed the engine with a little gas and it started to fire on a few cylinders, but not enough to run it. Poured a little more gas and it fired or should I say it liked the extra gas in that it exploded through the carb, blew the oil filler cap off, bulged the passenger side rocker cover and bulged the timing cover enough (1/4") so that I cannot see the timing line as it is hidden by the timing tab (bolt on). What gives?:confused: I checked the TDC and the distributor and it was right on. I then went through the motion of setting all the valves again, BUT......one rocker had a termendous amount of play in it, as if it wasn't adjusted. Then I remembered.... the phone rang, I answered it and then returned to completeing the adjustment of the valves, missing that one.:spank: I assume that there was ignition in that cylinder and it had no where to go but up and every where else. And so my question is, will the timing cover still suffice as is or is it needed to prevent the cam (hydraulic) from walking? I've been told that the cam stays or walks to the back of the block and the timing cover is not needed to do this job as this is a hydraulic set-up. Any comments would be greatly appreciated.:)

WriterDennis 12-05-2012 07:44 PM

If it will make you feel better...
 
I was in the process of changing the oil in my riding mower when my phone rang. I had already drained the oil, reinstalled the plug, but had not replaced the oil. The wind had blown the hood into the closed position by the time I returned. Between a lengthy phone call and the hood being closed, I forgot that I wasn't finished. Pistons sure make a lot of noise when they come through the block...

Dennis W. Parks
Author of automotive how-to books

techinspector1 12-05-2012 08:22 PM

Quote:

Originally Posted by hcompton (Post 1619600)
If you have a 327 chevy there is no way for exhuast to enter the crank case and blow out the filler cap and damage the timing cover.

Ummm, on its way to the carburetor, the fireball could have taken out some of the intake gasket, allowing pressure to enter the crankcase. I'd be thinkin' maybe tweaked throttle blade shafts too.

cobalt327 12-05-2012 09:24 PM

Quote:

Originally Posted by 27Tall T (Post 1619579)
:welcome:Just when I thought I had it all figured out this happened. I have a rebuilt 327 sbc that has not as yet been run. I should have set the valves and timing before installing it into the car, but oh well. Found TDC and adjusted the valves in the proper sequence and then set the distributor according to #1. Primed the engine with a little gas and it started to fire on a few cylinders, but not enough to run it. Poured a little more gas and it fired or should I say it liked the extra gas in that it exploded through the carb, blew the oil filler cap off, bulged the passenger side rocker cover and bulged the timing cover enough (1/4") so that I cannot see the timing line as it is hidden by the timing tab (bolt on). What gives?:confused: I checked the TDC and the distributor and it was right on. I then went through the motion of setting all the valves again, BUT......one rocker had a termendous amount of play in it, as if it wasn't adjusted. Then I remembered.... the phone rang, I answered it and then returned to completeing the adjustment of the valves, missing that one.:spank: I assume that there was ignition in that cylinder and it had no where to go but up and every where else. And so my question is, will the timing cover still suffice as is or is it needed to prevent the cam (hydraulic) from walking? I've been told that the cam stays or walks to the back of the block and the timing cover is not needed to do this job as this is a hydraulic set-up. Any comments would be greatly appreciated.:)

In the case of an engine that has not been broken in, the fuel you poured down the carb to start it leaked past the rings, into the crankcase. Then when the engine tried to start, the same lack of ring seal- aided by the valve being shut because it wasn't adjusted right- likely allowed the flame from that cylinder to force its way into the crankcase where there was now an explosive atmosphere.

Result = *BOOM*.

As long as the covers are still sealing and no gaskets were spit out in the explosion, and that there's nothing rubbing against rotating parts, I suppose you could continue the break in process and hope for the best.

But I'd rather see you take the time NOW to take the covers off and straighten/replace them along w/the gaskets and seals if needed.

Good luck.

cobalt327 12-05-2012 11:58 PM

A couple links that may help:

Adjust lifters
Cam break in
First start up

27Tall T 12-06-2012 08:47 AM

:)Thanks for the quick reply guys. Just to clarify things a bit.....Before starting the motor I found TDC, set the valves and then oil primed the motor. Then I used about a shot glass of fuel which I poured into the carb. Upon turning the motor over it began to fire on one or two cylinders. I gave another shot glass and a few more cylinders kicked. Thinking it wasn't getting enough gas I gave it 2 shot glasses and then it decided to let me know that something was wrong. This is a hydraulic cam with lifters and not a roller. When I took the rocker covers off to check the valve setting again, that is when I found that one valve that was very loose. Only when I tried to put the left side valve cover on again did I notice that the cover hold downs were very difficult to install. Could only get 2 at a time to screw in, the others were unable to even start. That is when I noticed that the valve cover was crooked along its entire length. Looked for a replacement cover at a wreckers and went through 3 of them before finding one that was straight. Is this a common occurence with valve covers where they are not straight along their entire length? I don't believe I had a hydraulic lock which would undoubtedly have caused more damage. At this point in time what would my next plan of attack be, try to start the motor or?????:confused:

Adam65 12-06-2012 09:33 AM

Big mistake just dumping gas down carb. Use a small funnel or similar to fill the carb bowls throw the bowl vent tubes, so the gas can be metered into the engine as it normally would.

delawarebill 12-06-2012 01:51 PM

take a deep breath 27...
 
and start over... go to TDC and re-adj the rockers for that stroke. make sure they are pumped up first. adj and spin the push rod till it stops turning then turn another 1/2 to 3/4 turn. then turn the engine one full turn and do the other half of the rockers. if u know for sure your on TDC #1 set dizzy to #1. u may want to pull the timing cover to fix first cause u gotta drop the pan too.


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