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-   -   Valve Adjustment Clarification (http://www.peachparts.com/shopforum/diesel-discussion/358837-valve-adjustment-clarification.html)

Mölyapina 08-23-2014 10:21 PM
Quote:
Originally Posted by Graham (Post 3377170)
Just got back from a roadtrip. While driving I was daydreaming about this issue. What I wondered, was - what is the FSM spec for the PS pump drive shaft nut?

When I got home, I looked this up in my manual. It said 50Nm. Which I think is about 37 ft.lbs.

So how much torque does it take to turn the engine over (using the PS nut)? If more than 37ft.lbs then nut would tighten. If less, then no affect on nut tightness.
Don't forget that the crank pulley is larger than the PS pulley. The torque required to turn the engine can be a little bit higher than 50Nm because of this. Like trying to start off on your bike in 1st vs. 7th gear.

toomany MBZ 08-23-2014 11:07 PM
1 Attachment(s)
If possible, use the crank bolt to turn the engine over, less stress all the way around.

Better yet, use a momentary bump switch connected to the terminal block just in front of the battery, as pictured.

Graham 08-24-2014 12:11 AM
Quote:
Originally Posted by Jooseppi Luna (Post 3377201)
Don't forget that the crank pulley is larger than the PS pulley. The torque required to turn the engine can be a little bit higher than 50Nm because of this. Like trying to start off on your bike in 1st vs. 7th gear.
It is true that there is some gearing. But really, that does not matter because my test only looks at the torque needed on the ps pulley nut. If engine turns, with less that 50 Nm at that nut, then nut will not be tightened to more than the fsm spec which would eliminate one reason not to use the PS nut. On the other hand test will support leathermangs contention if required torque is higher.


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