2001 S 4.0 full timing chain replacement

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Jul 29, 2019 | 10:46 PM

#21

abonano

Joined: Mar 2012

Posts: 4,759

Likes: 1,435

From: Hazlet Township, NJ

Yes, slightly shorter bolts are in order and the slack should be taken up once oil pressure builds in the tensioner.

Jul 29, 2019 | 10:55 PM

#22

Jim Blaine

Junior Member

Joined: Jul 2019

Posts: 2

Likes: 0

We are thinking maybe the secondary chains should be replaced too.. Thoughts?

Jul 7, 2022 | 06:34 AM

#23

kansanbrit

Senior Member

Joined: Dec 2013

Posts: 978

Likes: 275

From: Kansas

Quote:

Originally Posted by NBCat

The engine is to be rotated in a clock direction only when viewed from the front of the vehicle. Rotating the engine in an anti-clock direction results in damage to the main and rod bearing shells.

can anyone explain this to me?

Jul 7, 2022 | 08:11 AM

#24

S-Type Owner

Veteran Member

Joined: Feb 2018

Posts: 1,797

Likes: 684

From: The wilds of Montana

Quote:

Originally Posted by kansanbrit

can anyone explain this to me?

Bearing shells have tapered projections that hold them in place against the direction of engine rotation...

Jul 8, 2022 | 07:31 AM

#25

kansanbrit

Senior Member

Joined: Dec 2013

Posts: 978

Likes: 275

From: Kansas

Quote:

Originally Posted by S-Type Owner

Bearing shells have tapered projections that hold them in place against the direction of engine rotation...

Thanks but I don't think that is the reason, most engine shells have those. The AJ133 5.0 doesn't actually but should still not be rotated backwards. Personally I believe it is because the timing chain may skip if turned backwards because the tensioners go slack.