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Mystery Torque Spec

M

Muddy Rudder

New member
I need the torque specification for the flex plate bolts for a 1991 Volvo Penta 570A (4100116795). This is the splined flex plate that bolts to the flywheel. For some reason Volvo Penta has deleted the OEM shop manuals for my engine so they couldn't help. If anyone knows what to torque these to, I would appreciate the help.

Thanks
 
Once in a while you can find used manuals on eBay and I believe here is one of them… there are probably a bit more if searched on eBay,
www.ebay.com

Volvo Penta Marine 500 501 570 571 Engine Unit Workshop Service Manual | eBay

Find many great new & used options and get the best deals for Volvo Penta Marine 500 501 570 571 Engine Unit Workshop Service Manual at the best online prices at eBay! Free shipping for many products!
www.ebay.com

Sometimes when using a Volvo penta service manual there might not be a torque spec chart, but if you go to the area that you are working on and they show a picture and read how to install it. They sometimes will offer the torque spec in writing as you’re reading it ‘if that makes any sense…so look for that should you a buy manual.
 
Muddy Rudder said:
Thanks Mako. Thats what I wound up doing on a guess
Click to expand...
Oops, fat fingers sent the reply before I was done. I did 35 lbs. Of torque but used blue loctite.
I always overthink stuff, so I decided to check to see how far the primary drive shaft (PDS) engaged the flex plate. It only in engauges is about three quarters of an inch, possibly a full inch pretty sure it's less. I replaced the bearings and seals on the PDS and think it would be impossible to install the primary shaft in the wrong position because the aft bearings position on the shaft is dictated by a snap ring, and then the bearing is driven into a seat in the housing, then the subsequent snap rings and seals go in place above that. If the PDS were in the wrong position none of the subsequent parts would fit along with the snap rings that hold them in place.

Is that normal to have such a minimal amount of spline engaugement on the shaft that links all of the engine power to the drive components ?
 
I think the blue will be fine...the locktite is a 'just in case' redundancy.

I can't offer an opinion on the engagement of the spline as I've never done any work in that area on a volvo drive. That said, I'd think you would be able to see where the 'wear marks' are on the splined shaft and be able to tell if it went back in as far as it did before the bearing work.

Maybe sandkicker or one of those members with that specific VP knowledge will chime in...
 
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