Bent push rods and missing running like shit
01-06-2011, 03:24 PM
#1
Staging Lane
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Bent push rods and missing running like **** Planned on oil change and new trires this morning. Started car only to hear pop , then missing, so shut her down.
Had 15 - 40 weight oil, for summer, was planning lighter 5-30 for winter. And 25 Dergrees this morning, probably didnt help.
Top end has new cam, springs, timing chain and gears lifters, push rods, roller rockers.
Pulled valve covers , #8 exhaust rocker was off pushrod, and #8 intake pushrod was bent to ****.
But car still ran.
do you think it could have skipped timing????
Help
Had 15 - 40 weight oil, for summer, was planning lighter 5-30 for winter. And 25 Dergrees this morning, probably didnt help.
Top end has new cam, springs, timing chain and gears lifters, push rods, roller rockers.
Pulled valve covers , #8 exhaust rocker was off pushrod, and #8 intake pushrod was bent to ****.
But car still ran.
do you think it could have skipped timing????
Help
01-06-2011, 06:56 PM
#5
Staging Lane
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ouch Might have 1500 miles on setup since spring.
rockers look good, springs measure same, no brooken springs.
Could it be lifter got "solid" with heavy weight oil, in low temps????
Snows coming, Maybe, try , readjust valves , turn over, with new push rods?????? In warmer weather?
By the way , started yesterday, just to warm up , ran perfect>
Not a daily driver, just a toy, money pit ,lol, ****
rockers look good, springs measure same, no brooken springs.
Could it be lifter got "solid" with heavy weight oil, in low temps????
Snows coming, Maybe, try , readjust valves , turn over, with new push rods?????? In warmer weather?
By the way , started yesterday, just to warm up , ran perfect>
Not a daily driver, just a toy, money pit ,lol, ****
01-06-2011, 07:25 PM
#6
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I would recommend you get a set of hardened chromemoly pushrods from comp. They run about $100 but you wont bend them. Check your plugs, and then do a compression test. If everything checks out, try a new set of pushrods and see what happens.
01-06-2011, 07:31 PM
#7
i wouldnt run the risk of dropping new pushrods in and trying to start it... pull the coil wire or fuel pump fuse and put a straight pushrod in where the bent one came from. do not put the rocker on. turn it over and see if itll go down (to see if the lifters moving) DONT just put new pushrods in and start it. If for some reason a lifter is stuck i dont think youd like to put a valve through your piston. If you dont feel confident with it, pull the intake an examine everything. and just because a valve "looks" good doenst mean its straight. just my .02
Edit: also put in a lighter oil.
Edit: also put in a lighter oil.
Last edited by SoxXpupPeT; 01-06-2011 at 07:39 PM.
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01-06-2011, 07:41 PM
#8
No way would I just put new pushrods in it and call it a day. I'd find someone (or even buy since they are so handy) who has a lighted boroscope to check out the cylinder, valve and piston top. You could also inspect the lifter/lifter valley through the valve cover with the same tool. Harbor Freight has one for around a hundred bucks.
01-06-2011, 10:40 PM
#10
I’ll go this way:
1: Hydro-locked cylinder. After your last shut down, the cylinder stopped with the intake valve open. The fuel injector leaked the residual pressure from the rails or somehow, if you had the car out in the rain, water made it’s way in. Perhaps a leaking head gasket?
OR
2: Extreme pre-ignition or ignition way out of time with the cylinder. Bad wires or distributor cap.
I say this because if it was a skipped timing chain, more than just one cylinder would be in peril and the engine would continue to pop through the intake/exhaust.
I remember years ago there was I think some year of Firebird with hood scoop intakes that when parked in a driving rain, water would get into the intake and fill the cylinders with open intake valves. Busted stuff on startup.
1: Hydro-locked cylinder. After your last shut down, the cylinder stopped with the intake valve open. The fuel injector leaked the residual pressure from the rails or somehow, if you had the car out in the rain, water made it’s way in. Perhaps a leaking head gasket?
OR
2: Extreme pre-ignition or ignition way out of time with the cylinder. Bad wires or distributor cap.
I say this because if it was a skipped timing chain, more than just one cylinder would be in peril and the engine would continue to pop through the intake/exhaust.
I remember years ago there was I think some year of Firebird with hood scoop intakes that when parked in a driving rain, water would get into the intake and fill the cylinders with open intake valves. Busted stuff on startup.
Last edited by Paul Bell; 01-06-2011 at 10:45 PM.
01-07-2011, 09:48 AM
#11
I’ll go this way:
1: Hydro-locked cylinder. After your last shut down, the cylinder stopped with the intake valve open. The fuel injector leaked the residual pressure from the rails or somehow, if you had the car out in the rain, water made it’s way in. Perhaps a leaking head gasket?
OR
2: Extreme pre-ignition or ignition way out of time with the cylinder. Bad wires or distributor cap.
I say this because if it was a skipped timing chain, more than just one cylinder would be in peril and the engine would continue to pop through the intake/exhaust.
I remember years ago there was I think some year of Firebird with hood scoop intakes that when parked in a driving rain, water would get into the intake and fill the cylinders with open intake valves. Busted stuff on startup.
1: Hydro-locked cylinder. After your last shut down, the cylinder stopped with the intake valve open. The fuel injector leaked the residual pressure from the rails or somehow, if you had the car out in the rain, water made it’s way in. Perhaps a leaking head gasket?
OR
2: Extreme pre-ignition or ignition way out of time with the cylinder. Bad wires or distributor cap.
I say this because if it was a skipped timing chain, more than just one cylinder would be in peril and the engine would continue to pop through the intake/exhaust.
I remember years ago there was I think some year of Firebird with hood scoop intakes that when parked in a driving rain, water would get into the intake and fill the cylinders with open intake valves. Busted stuff on startup.
01-07-2011, 04:23 PM
#12
I'm also thinking maybe there's bent valves. Whatever happened, cylinder number eight should be looked at closely.
If it was a collapsed or stuck pumped up lifter, it would not bend the pushrods. If it was a skipped timing chain, it would affect much more than one cylinder.
I'm leaning more towards bad timed missfire due to shot wires or cap.
If it was a collapsed or stuck pumped up lifter, it would not bend the pushrods. If it was a skipped timing chain, it would affect much more than one cylinder.
I'm leaning more towards bad timed missfire due to shot wires or cap.
01-08-2011, 08:42 AM
#14
Staging Lane
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snow sucks......... Bought a car to tinker with.
No one told me how much fun a lt1 was...m f er
Gotta get above freezing before a take a closer look.
Gone fishing
No one told me how much fun a lt1 was...m f er
Gotta get above freezing before a take a closer look.
Gone fishing
01-08-2011, 11:17 AM
#16
Easiest way to check for bent valve is to get a spark plug adapter & connect shop air to the cylinder. You will hear air come out of the port if the valve is bent.
Typically push rods do not bend without a reason.
I would thoroughly check everything out before putting it back together.
It may be worse next time if it happens again.
Typically push rods do not bend without a reason.
I would thoroughly check everything out before putting it back together.
It may be worse next time if it happens again.
01-08-2011, 05:54 PM
#17
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thanks dude way too cold outside, thanks for the heads up
Easiest way to check for bent valve is to get a spark plug adapter & connect shop air to the cylinder. You will hear air come out of the port if the valve is bent.
Typically push rods do not bend without a reason.
I would thoroughly check everything out before putting it back together.
It may be worse next time if it happens again.
Typically push rods do not bend without a reason.
I would thoroughly check everything out before putting it back together.
It may be worse next time if it happens again.
01-14-2011, 06:38 AM
#19
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Cold borrowing a boroscope today, and getting a new air gun, to check for valve leakage.
Like to get above freezing, if problem was a frozen lifter.If all checks out, car still has that thick oil in in and is stored outside.
Like to get above freezing, if problem was a frozen lifter.If all checks out, car still has that thick oil in in and is stored outside.