Posted by D. Novotny (216.86.71.240) on 17:54:12 18/02/06
In Reply to: Need to repair cylinder bore ID on alloy block posted by Erik Berg
Aluminum blocks have been welded quite successfully - drag and
endurance racers do it quite often - in the USA. However, the
process involves careful preheating, welding, thermal management
while welding and post weld stress relieving and re-heat treating
in some cases.
HOwever, depending on the severity of the weld/damage, it may cost
more to weld and requalify the machine surfaces to straighten
things out than the block is worth.
Moreover, if you've welded up what was a water jacket between
the bores, localized overheating could be a lingering problem.
In the long run, you may be better off simply boring out the alloy,
fitting in an aluminum tube/sleeve and welding the top and bottom.
THis would preserve the cooling jacket integrity much better than
than merely ladeling in a bunch of weld and dealing with same.
By the way and more importantly, lock ring failures (root cause
of your problem) are caused by shutting down an overheated
engine without benefit of cool off lap, too tight an endplay of the
pin to lock rings and/or bent con rod.
The first two conditions cause the aluminum piston to shrink down
faster over hot steel pin shoving out lock ring - latter condition
is caused by poor inspection and/or hydraulic lock.
In some instances, improper assembly techiques can cause the lock
rings to break but usually it is the items mentioned
above...
Please go to the new Surface Engineering Forum as this old message board is a read only archive. Please copy and paste relevant information or link to the page if you wish to reactivate a thread on the new forum.
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