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Old 12-02-2018, 08:37 PM   #21
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Here`s a little more progress today on stripping the engine.
Mating engine with stand:





Opossum-damage, close-ups:




Thick oil-mud on the heads:



Sophisticated method to prevent steering pump shaft from spinning:



Stripped:




We`ll take a peek into the engine next time.
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Old 12-06-2018, 10:35 PM   #22
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Sump off. Looks clean, no sludge or metal debris. Except for those green and brown plastic fragments..





Inside everything seems intact so far.





Let`s approach now from the heads. Cylinder 4-6 first.



Scavanging pump off:



Head cover off. Something seems missing from there. Perhaps the origin of the plastic debris in the oil pan?



Not much left. The middle part, the actual rail is completely gone.


After the plastic chain guide completely had given up the chain was running on the steel bracket. May have been producing an awful sound though..

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Old 12-06-2018, 10:42 PM   #23
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Lifters, cylinder head, liners all look fine:







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Old 12-07-2018, 10:48 AM   #24
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Looks like we are tackling similar projects...I posted mine up on the General Discussion forum. Mine is a 3 chain 03 motor though.
Just got my drivers side head back on and after the cams are back in and i button that side up, I plan on tearing down the other side.
Where in N. Cal are you?
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Old 12-07-2018, 04:12 PM   #25
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Hey, I`m located close to San Jose. Are you nearby?

Quote:
Originally Posted by Ottomotion View Post
Looks like we are tackling similar projects...I posted mine up on the General Discussion forum. Mine is a 3 chain 03 motor though.
Just got my drivers side head back on and after the cams are back in and i button that side up, I plan on tearing down the other side.
Where in N. Cal are you?
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Old 12-07-2018, 09:56 PM   #26
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Few more pics for today. Taking off the oil pump cover:



Pump is in decent condition.



So is this chain guide.



Let`s move to head 1-2-3.



Oops, what`s left of this chain guide does not seem as good as the long rail. Actually, it came all the way from the other side.



Another piece landed here:



The chain guide for head 1-2-3 is intact.



Getting the head off.



Here we go.



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Old 12-07-2018, 10:01 PM   #27
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This is a bit kind of puzzling: the valves were hitting the pistons, but not on the side where the chain guide was totally missing so the timing was off but on the other side (1-2-3).



What I can think of is that the chain guard got chewed up by the timing chain resulting in jumping a tooth? What an unfortunate coincidence...
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Old 12-08-2018, 07:45 AM   #28
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Fresno.
Keep it up. Its nice to see someone else attempting this same task at the same time.

So if I am seeing and reading correctly, your chain guide/tensioner failed and your chain was riding on metal?
Interesting fail....My car has just over 100K on the clock and the pads look like new....
Now the valve spring and lifter for #5 intake...thats a different story.
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Old 12-08-2018, 08:43 AM   #29
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Quote:
Originally Posted by Ottomotion View Post
Fresno.
Keep it up. Its nice to see someone else attempting this same task at the same time.

So if I am seeing and reading correctly, your chain guide/tensioner failed and your chain was riding on metal?
Interesting fail....My car has just over 100K on the clock and the pads look like new....
Now the valve spring and lifter for #5 intake...thats a different story.
Hey, I`ll upload new pics soon. Fresno is not so far away from here, we should meet up once both cars run again

As for the engine, indeed, the primary reason for the engine failure was the excessive wear and subsequent detachment of the chain guard. I think the chain picked up a piece of the guard on the opposite side and somehow made the timing to jump. Otherwise I can`t explain why the timing was messed up and the valves touched the pistons. Failing of these guards is frequent in these engines, yours may have been replaced earlier, or the 3-chain engines have a different design? BTW, my car has 100K miles in it and I don`t think it has been taken apart.
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Old Yesterday, 11:09 PM   #30
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I was gonna stop with the teardown at this point, since i found the culprit for the engine failure and I thought after rebuilding the heads and the timing everything can go back on and the engine is ready to go. Yet, I thought it would be a mistake to reassemble the motor without knowing what the piston rings and rod bearings look like, especially because the valves were touching the pistons. So I decided to go more deeply into the engine if I got this far. First, I removed the IMS cover:



This is still the original dual-row bearing, the original grease has long been replaced to engine oil that`s flowing out from the IMS cavity. The bearing looks in great condition though.



Splitting the cases after removing a bucket of nuts and bolts:



Apart:








I think it was a good idea to remove the pistons: the rings are stuck into their grooves with gunk. Oil change wasn`t a too frequent practice here. I don`t think those rings were sealing too well..



This chain guide is badly worn too. Seems a bit undersized for this job. Note that the four other rails for the timing chains were in perfect condition.

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Old Yesterday, 11:10 PM   #31
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Bearings and bearing journals show no wear:

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