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Aluminum grindings in case

  • Thread starter Thread starter OLDENUFF
  • Start date Start date
O

OLDENUFF

Guest
I installed an 850 top end on my 750 a while back and had to grind out the case a wee bit to get the cylinders to seat. I was sold the cylinders as from a 79 but obviously they were 80 or newer.I stuffed rags in the case before grinding. I then vacuumbed and air hosed it before pulling out the rags. I'm sure some grindings made there way dowm into the crankcase. Will they hurt anything or will they end up in the oil filter?I used a very fine wheel on my Dremel so the filings are very fine.
 
I would suspect that the few filings that might make it past the screen on the oil pump intake would be stopped by the filter before making it to the rest of the engine.

Keep us posted on your "new" engine. :D

.
 
Hi,

You might want to make your first couple of oil changes at fairly quick intervals. But I think you'll be OK.


Thank you for your indulgence,

BassCliff
 
What type of bit did you use on the Dremel? If you used a metal bit you'll be ok - the alloy is real soft and will just get picked up in the filter as others have said. If you used a grindstone then you could have left some very hard grit in there and that's a different story. If you did use a stone and it's looking a bit smaller than when you started I would flush the bottom end through with diesel a few times.

I rebuilt a GT500 10 - 20 odd years ago for a guy who had done a porting job and used one of those cheapo pink stones - cylinders still on the bike to save the cost of a base gasket and the hassle of re-fitting the barrels! You could have sunbathed on the amount of sand in the bottom of that crankcase. I know this was cutting iron rather than alloy and wearing the stone a lot more but it illustrates the point.
 
It was a metal bit. I'll do an oil change after the initial warmup and carb sync. Thanks for the replies. I feel better about it now.
 
blowerbike said:
the roller bearing engines will "digest" a huge amount of aluminum and still live a long life.
Click to expand...


Yep these are very forgiving engines. I love these roller cranks

maybe drop the lower oil pan when doing the first or second oil/ fliter change. I know it's messy and some times the exhaust has to come off but that is the "extra 9 yards" to do the best job.

clean it out and write your name and date in there. or super glue another magnet in there. I do dumb stuff like that..
 
Hi Oldenuff, as you have read from the replies here the engine should be fine due to the small size and limited amount of metal that may have dropped into the engine. I agree that some small amount of fine ally shouldn't harm the engine as the oil filter will soon pick it up. What does create excessive engine wear and damage is not dropping the sump and cleaning the grey sludge out, the oil filter doesn't stop this stuff and it circulates through the entire engine grinding away at components. The grey sludge is "clutch plate" and its very abrasive which is why it will do more damage than a few grams of ally grindings floating around the engine.
 
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