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Author Topic: Different jugs left to right?  (Read 3513 times)

Offline Rob Valdez 79 R65

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Re: Different jugs left to right?
« Reply #15 on: February 09, 2011, 08:09:15 PM »
When you have more than one piston/cylinder together, I think they are needed.

I don't know why the [Haynes?] manual has that in there.
« Last Edit: February 09, 2011, 08:10:06 PM by Rob_Valdez_79_R65 »
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Offline Justin B.

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Re: Different jugs left to right?
« Reply #16 on: February 10, 2011, 07:56:36 AM »
I have used a ring compressor just to see if it was easier but found it's just as quick to do one ring at a time.  The only up-side to the compressor is that you can stagger your ring end-gaps liike the book says but a lot of "experts" seem to agree this is not necessary since ring rotate during engine operation.
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Justin B.

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Offline Bob_Roller

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Re: Different jugs left to right?
« Reply #17 on: February 10, 2011, 08:26:38 AM »
With the pistons removed, clean to top of both, there is an arrow stamped into the metal, the arrow points forward .

I can't remember the specifics of why this is required, it came up here a while back in a thread .

It is also stated in the BMW shop manual, but with no explanation for it .  
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Offline Barry

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Re: Different jugs left to right?
« Reply #18 on: February 10, 2011, 10:36:01 AM »
Quote
With the pistons removed, clean to top of both, there is an arrow stamped into the metal, the arrow points forward .

I can't remember the specifics of why this is required, it came up here a while back in a thread .

It is also stated in the BMW shop manual, but with no explanation for it .  

Presumably the pistons will have the usual slightly offset gudgeon pins to ease stresses over TDC. The arrows will be to ensure both pistons are offset in the same direction.

Here's one of the best explanations I've seen about piston offset.

http://www.motorcycleproject.com/motorcycle/text/cows-offset.html
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Barry Cheshire, England 79 R45
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