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Nate, I'd never thought about even the risk...! In my one time up on this, I think I used the intake manifold in the first step only to support the engine lifting plate---and the only thing I'm sure of is that I installed sealant (and torqued, if not even re-torqued) with the engine in place in the engine bay. And then re-stabbed the distributor, and then the replacement oil pan...Lee

@nate posted:

Back to the jackshaft assembly for a moment...I've always tried to install the jackshaft and intake manifold at the same time, torqueing all bolts in the proper sequence, and avoided removing the jackshaft alone later for fear of promoting manifold leaks.

Thinking now this is excessive caution.....but it begs a question:  If the jackshaft is removed by removing it's four main bolts/screws, should the 8 other manifold bolts be loosened and ultimately re-tightened in proper sequence, or should they just be left alone, to minimize possible disturbance to manifold sealing surfaces?

I can see an argument for either option, anybody end up with a leak after R&R of a jackshaft? Thanks! Nate

I'm VERY likely wrong on this, but since there is relatively little force exerted on the intake manifold compared to main bearings, cylinder heads, and such, I wasn't particularly worried about disturbing the seals.  Of course the fact that I hadn't even considered that MIGHT have been a contributing factor.

Hopefully this rebuild will be the last one for a while and will be torqued to spec with the jackshaft in place.


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