Swapping engines

[elgyqc]

Perhaps there is something I don't get but as I understand it you have to lock the cams, at least, in the opposite head to the one you are working on. Personally I lock both.
You are right, on the 5 chain engines you only lock one cam on each side with the shorter tool.

[pilot4fn]

Originally Posted by elgyqc

Perhaps there is something I don't get but as I understand it you have to lock the cams, at least, in the opposite head to the one you are working on. Personally I lock both.
You are right, on the 5 chain engines you only lock one cam on each side with the shorter tool.

Isn't the reason JFP mention for only driver side bank (2) cam to be locked on 5-chain engine because:
to change the IMSB you take only two chain tensioners out - 1 tensioner for the IMS - cam and 1 tensioner for the IMS - crank.
Risk to have the chain to skip a teeth is when there is no tension on the chain.
On the passenger side bank (1), the tensioner will remain in place under tension and the chain should not have a chance to skip there while you work on IMSB.

[LoneWolfGal]

Ready for action. As you can see, I have all the tools I'll need.

[LoneWolfGal]

Originally Posted by pilot4fn

Isn't the reason JFP mention for only driver side bank (2) cam to be locked on 5-chain engine because:
to change the IMSB you take only two chain tensioners out - 1 tensioner for the IMS - cam and 1 tensioner for the IMS - crank.
Risk to have the chain to skip a teeth is when there is no tension on the chain.
On the passenger side bank (1), the tensioner will remain in place under tension and the chain should not have a chance to skip there while you work on IMSB.

Actually, every knowledgeable source, including JFP, Jake Raby, and LN, recommends locking the exhaust cam on bank 1, the passenger side, on a 5-chain engine. Regarding tensioners, it's my understanding there are three, two timing chain tensioners and one IMS chain tensioner. LN recommends removing all three:

https://lnengineering.com/files/2023-IMSS-instructions-rev-03-24.pdf

JFP, care to weigh in?

[LoneWolfGal]

Originally Posted by elgyqc

Perhaps there is something I don't get but as I understand it you have to lock the cams, at least, in the opposite head to the one you are working on. Personally I lock both.
You are right, on the 5 chain engines you only lock one cam on each side with the shorter tool.

LN's IMS toolkit includes only one shorter, single-cam locking tool, which I plan to use to lock bank 1's exhaust cam, since locking only one cam (in addition to locking the crank at TDC) immobilizes all five chains. If I wished to also lock bank 2's cam as belt and suspenders I would need to procure another single-cam locking tool.