cylinder walls...???
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Road Warrior
Joined: Nov 2007
Posts: 1,641
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From: south of Boston
cylinder walls...???
so this is what both cylinder walls look like after only about 500 miles... they're not gouged, just very lightly scored
the only conclusion i can come to is that because the cylinder studs were all virtually stripped, and wasn't getting a proper torque on them, they vibrated?
the pistons look very similar
any ideas
the only conclusion i can come to is that because the cylinder studs were all virtually stripped, and wasn't getting a proper torque on them, they vibrated?
the pistons look very similar
any ideas
Last edited by jsbridgew; Sep 12, 2013 at 04:01 PM.
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
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From: Coromandel Peninsula New Zealand
There will always be marks on the jugs if the motor has been run....remember, the pistons make the return journey 2-3,000 times a minute and over 500 miles that is 1.8 million times if cruising for 500 miles.
With a better picture I might make more of a drama of the situation but I don't often pull jugs off after 500 miles so its difficult to compare with anything.
With a better picture I might make more of a drama of the situation but I don't often pull jugs off after 500 miles so its difficult to compare with anything.
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Aha! Now I get you....no, that ain't pretty and you may well be right in your diagnosis.
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Road Warrior
Joined: Nov 2007
Posts: 1,641
Likes: 4
From: south of Boston
i know.... pictures of things like this can't really tell the actual story
they're .020 over, and i hate to think i'll need a whole new bore and pistons....was hoping just a light clean up would be okay
damn
they're .020 over, and i hate to think i'll need a whole new bore and pistons....was hoping just a light clean up would be okay
damn
Road Warrior
Joined: Mar 2007
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From: Florida
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Seasoned HDF Member
Joined: Dec 2010
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From: Coromandel Peninsula New Zealand
Try honing it, if the mark goes away it'll be fine. Might also have been caused because incorrect torque didn't pull the jug back into round.
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Damn, hate when that happens.
That could have happened on initial start up if it was not heat cycled, or, more than likely, too tight of piston to wall clearance from the get-go.
Or maybe like you said about the studs, get a mic in there to find out.
Either way, looks like the piston grew too large for the cylinder.
That could have happened on initial start up if it was not heat cycled, or, more than likely, too tight of piston to wall clearance from the get-go.
Or maybe like you said about the studs, get a mic in there to find out.
Either way, looks like the piston grew too large for the cylinder.