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Strange sound from rebuilt engine...

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Old 03-02-2013, 01:57 PM
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Vorsicht
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Can someone recommend a technique to remove the lifters from the rocker arms? The last time I did this I found it is difficult to get them out without damaging them.
Old 03-02-2013, 03:31 PM
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bobt993
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Peter, I feel for you on this one. New lifters are almost impossible to remove from the rockers without damaging the somewhat fragile head. You can try cleaning the oil off the top and grabbing them with a paper towel in the jaws of a set of grommet plliers (plastic pliers). Your going to end up replacing some if you think they need to be inspected. Make sure the plastic seal at the base is not left inside the lifters that is easy to miss. (even from the original replacements).
Old 03-02-2013, 07:08 PM
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BigMikeATL
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I just finished reading your thread. Good luck with the rebuild and keep up the positive attitude.
Old 03-02-2013, 07:14 PM
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Originally Posted by BigMikeATL
I just finished reading your thread. Good luck with the rebuild and keep up the positive attitude.
Thank You!
Old 03-04-2013, 09:53 PM
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Default Strange sound from rebuilt engine SOURCE DISCOVERED

VIEW DISCRETION IS ADVISED!



I finally found out the cause of the noise and it aint pretty.

The connector rod nuts were colliding with the very bottom of the cylinder. This created some raised ridges inside the cylinder wall which then scaped along the piston skirt. This happened on all 6 cylinders although side 1-2-3 is worse.

After removing the pistons I found the I could move the rods in and out about 1/16 to 1/8 inch. Sadly, I knew this BEFORE I put the engine back in the car. I mistakenly believed this to be normal. The use of Plastigage would have prevented this. Needless to say I am now a member of camp Plastigage.

I discussed this with Steve W. and our current theory is the nuts were not torqued down enough due to a faulty/inexpensive torque wrench. I am sending the rods up to Steve for inspection.

I am continuing with disassembly and cleaning.
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Old 03-04-2013, 10:00 PM
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Wow Peter, Didn't expect this.

On a bright side I bet your Lifters and the like are in good working order.
Old 03-04-2013, 10:04 PM
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Oh ****, ouch.

I'm confused though. 1/8th of play on the rods is obscene. Was that really just from rod bolts not quite tight enough?

what did you torque those to?

sorry to hear about the damage, but you may at least be able to save the cylinders.
Old 03-04-2013, 10:18 PM
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Originally Posted by Quadcammer
Oh ****, ouch.

I'm confused though. 1/8th of play on the rods is obscene. Was that really just from rod bolts not quite tight enough?

what did you torque those to?

sorry to hear about the damage, but you may at least be able to save the cylinders.
Rod bolts torqued to 40 ft-lbs. And remember this is just a theory right now. The only other thing I can think of is the crankshaft is worn. Any other ideas?
Old 03-04-2013, 10:19 PM
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Originally Posted by trophy
Wow Peter, Didn't expect this.

On a bright side I bet your Lifters and the like are in good working order.
Yes, the silver lining!
Old 03-04-2013, 10:19 PM
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AOW162435
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Peter,
That's painful, but at least you've made progress.

PM sent.


Andreas
Old 03-04-2013, 10:21 PM
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Are the rod bolts directional?

I see some references with them threaded in from the crank side and other references showing them threaded in from the piston side.

"After removing the pistons I found the I could move the rods in and out about 1/16 to 1/8 inch."
"In and out" perpendicular to the rotation of the crankshaft?
Old 03-04-2013, 10:32 PM
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Even if the rod nuts were finger tight, you wouldn't get 1/16" play. Did you not install rod bearings?

Honestly -- and please don't take this the wrong way -- you might want to have a professional do the reassembly. If you thought having that kind of rod play was normal, well....maybe have a professional do the job this time.
Old 03-04-2013, 10:34 PM
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Originally Posted by AOW162435
Peter,
That's painful, but at least you've made progress.


Andreas
Yes, half the battle is knowing what you're dealing with.
Old 03-04-2013, 10:36 PM
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Originally Posted by NP993
Even if the rod nuts were finger tight, you wouldn't get 1/16" play. Did you not install rod bearings?

Honestly -- and please don't take this the wrong way -- you might want to have a professional do the reassembly. If you thought having that kind of rod play was normal, well....maybe have a professional do the job this time.
Perhaps. There is a first time for everything. Rod bearings installed on rod by professional (Steve W.)
Old 03-04-2013, 10:43 PM
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Here is a short video showing the amount of play.



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