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floatinghead

Oil pump chain: too loose?

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(edited)

About to put my oil pan back on and wondering if this is too loose?  Haven’t done it, but it seems like there are shims to get the correct tension.  Pretty straightforward?  Any chance of getting locally (Portland) or do I need to order online?
 

I feel like there’s always something keeping me from putting this thing back together.


thanks,

 

baron

 

Edited by floatinghead
shrink movie

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definitely too loose!! shims should be used to space pump away from mounting bracket.   Haynes manual  chapter 1  para 42   #6  says ", apply light thumb pressure (to passenger/ rt side) of chain.  only slight deflection should observed" .several thicknesses  of shim  are available from the usual sources.  

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(edited)

One symptom of a (too) loose oil pump chain is a loud chain rattle.  It's loud because it is hitting the oil return pipe on the front of the oil pump. If you can push the chain over and touch the pipe it is definitely too loose.  The deflection is supposed to be +/- 5mm.

Old_Oilpump_Chain_Grooves.jpg

 

OilpumpChain.jpg

Just noticed the above statement should read "pump shimmed".

 

Edited by PaulTWinterton
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when in doubt shim it out! 

 

Believe the shim is an item still available from BMW

 

but what do I know. I ran a double row timing chain master link on a single row chain and they all said it would go nuclear.  

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Thanks for the replies.
Paul, my chain does hit, so looks like I’m shimming. Can I loosen up the bolts and put a feeler gauge to see how many I’ll need?  I’ve only seen the 0.1mm thickness online, not the 0.3mm. I’ll see what I can get through BMW as well.  
 

thanks,

 

b

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12 minutes ago, floatinghead said:

 I’ve only seen the 0.1mm thickness online, not the 0.3mm. I’ll see what I can get through BMW as well.  

 

You can always stack more than one, but keep that a secret. 

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20 minutes ago, floatinghead said:

 I’ve only seen the 0.1mm thickness online, not the 0.3mm. I’ll see what I can get through BMW as well.

Or just buy one & use it as a pattern to make more from your favourite beercans.

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1 minute ago, dlacey said:

Or just buy one & use it as a pattern to make more from your favourite beercans.

Brilliant! 

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(edited)

And at around $9 a shim, the beer equivalent will make a lot more shims

 

Edited by floatinghead
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(edited)
3 hours ago, floatinghead said:

lot more shims

 

Pass on purchase.  Go straight to beer (can).  

 

I might have a picture of a shim.  Anyone else?

 

The only important design feature is the pass-through hole for the oil passage IIRC.

Edited by PaulTWinterton

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I’ll try and pull the pump tomorrow morning and see if it has a shim to trace or if I can make one.  I like the beer can support!

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I just buy the shims.  In the big picture they are cheap.  And made correctly. And cost less than my time to cut up a beer can.  And don't have bends or winkles in the edges that can alter the tq of the bolts holding them on.  And aluminum compresses, the OEM stainless ones do not.

 

You spend a lot of time and money building an engine... And then you are going to put a piece of a beer can in the critical oil pump assembly? Really?

 

Ymmv...

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Keep in mind while fabricating shims, the main oil flow out of the pump is sealed by the shim.  Try not to gripe about low oil pressure later with a home made shim in there.

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59 minutes ago, M2M3 said:

You spend a lot of time and money building an engine... And then you are going to put a piece of a beer can in the critical oil pump assembly? Really?

 

Yep +1 ... this is a time I agree with mlytle/M2M3. -KB

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(edited)

Got it and I'll likely purchase a legit shim.  It looks like I have one shim in there ( surprised that it doesn't sit flush with the pump and is kinda bowed in place), but as I've never been this close to the inside of the engine, its all I kind of new.  

 

Any tricks to getting the sprocket off (single nut)?  I just start to spin the engine.  It's not reverse thread is it??  Looked through threads but didn't see anything.  Didn't want to take an impact wrench to it.

 

thanks,  B

Edited by floatinghead

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