v7 850 oil change: torque specs?

[blackbuell]

Changing the oil in my 2021 850 special. Checked the owner's manual, but couldn't find the torque specs for the oil drain plug and the oil filter cartridge screw. Anybody know them offhand?

Thanks,

Jon

[Dirk_S]

I don’t have one of those elusive E5 engine manuals in my library, but the V7 III engine manual states for:

Rear drain plug: 20-22 Nm (14.75-16.23 lb ft.)
Oil filter bolt: 18-22 Nm (13.28-16.23 lb ft.)

Seeing these are drain bolts threaded into an aluminum engine, probably just as fine simply hand-tightening followed by a wrench-tightening a hair past snug.

[Kev m]

Seeing these are drain bolts threaded into an aluminum engine, probably just as fine simply hand-tightening followed by a wrench-tightening a hair past snug.

THIS - USE CARE.

I no longer use torque wrenches on these items since Jay did and snapped his smallblock oil filter cap in half.

[blackbuell]

Thanks Dirk and Kev

Jon

[mechanicsavant]

Ah Ha ! So it is 1/4 turn “before” it snaps . Got it

[Kev m]

Ah Ha ! So it is 1/4 turn “before” it snaps . Got it

Tight is right

Too tight is broken

[Bulldog9]

Snug e-nuf is how tight I go on things like drain plugs etc. They're a very few things that torque values are essential This would be head bolts, clutch/flywheel, etc. Most other fasteners it's not that critical.

[Perazzimx14]

For drain plugs and small fasteners I use the longest cheapest clicker type torque wrench I can find with a 24" cheater on the handle and use red Loctite on anything threaded.

 

[Dirk_S]

For drain plugs and small fasteners I use the longest cheapest clicker type torque wrench I can find with a 24" cheater on the handle and use red Loctite on anything threaded.

You pulled the girls’ pigtails and stuck frogs into their lunch bags when you were little, didn’t you.

[sib]

For drain plugs and small fasteners I use the longest cheapest clicker type torque wrench I can find with a 24" cheater on the handle and use red Loctite on anything threaded.

I prefer to use an impact driver intended for truck wheel bolts.  Tighten until the drain plug spins freely.

[Off @ 90]

I don’t have one of those elusive E5 engine manuals in my library, but the V7 III engine manual states for:

Rear drain plug: 20-22 Nm (14.75-16.23 lb ft.)
Oil filter bolt: 18-22 Nm (13.28-16.23 lb ft.)

Seeing these are drain bolts threaded into an aluminum engine, probably just as fine simply hand-tightening followed by a wrench-tightening a hair past snug.

These torques seem way too high for aluminium threads in the rear drain .Mk2 book states 12NM for drain plug .I use that for oil filter too and pretty sure the Mk3 has the same filter housing.

[Dirk_S]

These torques seem way too high for aluminium threads in the rear drain .Mk2 book states 12NM for drain plug .I use that for oil filter too and pretty sure the Mk3 has the same filter housing.

Hey now, don’t hate the messenger! Here are screenshots from the V7 III engine manual:







I’m curious where you found the torque specs for the V7 II—I did a couple quick scrolls through both service and engine manual, and only found torque spec for the front drain bolt.

[Vagrant]

That come from the same people who tell you to put in over two quarts of oil in the engine.

[Kev m]

Hey now, don’t hate the messenger! Here are screenshots from the V7 III engine manual:







I’m curious where you found the torque specs for the V7 II—I did a couple quick scrolls through both service and engine manual, and only found torque spec for the front drain bolt.

If my career in technical publishing has taught me anything, it's that you don't blindly trust any manual. You look with a critical eye at every spec, like that Chevy Corvette manual I was working with that suggested a negative main bearing clearance...

I probably find more discrepancies in torque specs than anywhere else.

PS, I'm pretty sure that was the torque spec Jay was following when he split his filter cap.

[Dirk_S]

If my career in technical publishing has taught me anything, it's that you don't blindly trust any manual. You look with a critical eye at every spec, like that Chevy Corvette manual I was working with that suggested a negative main bearing clearance...

I probably find more discrepancies in torque specs than anywhere else.

PS, I'm pretty sure that was the torque spec Jay was following when he split his filter cap.

Good point. Snowbum, the well-known (albeit largely unorganized) Airhead expert points out on his webpages that older BMW manuals sometimes had incorrect imperial torque specs (which is why I now pay attention to the manufacturer’s country of origin and subsequent default unit of measure).

[Dr. Enzo Toma]

Ducati have gotten drain plug torque specs incredibly wrong before, it happens.
https://www.ducatiscramblerforum.com/threads/nasty-mistake-workshop-service-manual.10002/
For someone who's just looking to do an oil change on their bike (good for them!) and doesn't wrench enough to have a concept of torque specs, but are trying their best and following a manual, that can unfortunately go sideways.