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Brand new timing chain and gears?




JAMMAN

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OK I can't post a youtube vid here for some reason.
 

Doofy

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I watched both of them. Turn the engine over a few times by hand. One side should be taunt and a little slack in the other side. Looks normal to me.
 

AllanD

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A common problem years ago was guys Rebuilding their Chevrolet engines and wanting to do everything the car mags advocated.

They'd have their engines "Align bored" without them (or their engine machinist) realizing that since the block material was softer than the material the bearing caps were made from this raised the main bearing axis in the block and this has certain repercussions

One of which is such engines tend to have transmissions issues because the crankshaft axis is not aligned with the transmission input shaft because only rarely do people bother to check the engine dowel pin placement.

This is a good part of the reason why the TH400 automatic got a reputation for failure in drag racing applications (these transmissions front pump is sensitive to misalignment.

Another issue is since the crank axis is raised there is more slack in the timing chain which tends to cause timing scatter.

As a note a 2.9 or 4.0 engine would not have the issue you pictured, as both engines are fitted with tensioners to prevent chain slack.


Not to say there is a problem here...
 
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JAMMAN

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Thank you for the respons(es).

No align bore here, a totally stock 1997 mercury mountaineer 5.0 being grafted to a 2000 ranger. The new chain is looser than the one I removed with over 150,000 miles on it.

Had a second problem with a melling high volume oil pump. I sat almost .300" higher than the stock one and neither of my oil pans would fit.

Jim
 

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