Media blasting of timing pulley teeth
Media blasting of timing pulley teeth
(OP)
In our diesel engine remanufacturing operation we have a series of engines that use a timing belt to drive the camshaft, which in turn operates both the valves and the individual injection pumps.
The original surface roughness of the pulley teeth is Rz6 for the steel camshaft pulley and Rz15 for the sintered crankshaft pulley.
Does anyone have an idea of surface roughness limits for timing belt pulley teeth? For cleaning, we can soda blast (no influence on surface but expensive & time consuming) or aluminum oxide or ceramic bead blast (rougher surface but cheaper & faster).
Thanks!
The original surface roughness of the pulley teeth is Rz6 for the steel camshaft pulley and Rz15 for the sintered crankshaft pulley.
Does anyone have an idea of surface roughness limits for timing belt pulley teeth? For cleaning, we can soda blast (no influence on surface but expensive & time consuming) or aluminum oxide or ceramic bead blast (rougher surface but cheaper & faster).
Thanks!





RE: Media blasting of timing pulley teeth
RE: Media blasting of timing pulley teeth
Do these really get so much buildup that they need blasting of any sort, in lieu of chemical cleaning?
RE: Media blasting of timing pulley teeth
RE: Media blasting of timing pulley teeth
Mike Halloran
Pembroke Pines, FL, USA
RE: Media blasting of timing pulley teeth
RE: Media blasting of timing pulley teeth
Unless of course they have aluminium components.
Regards
Pat
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RE: Media blasting of timing pulley teeth
RE: Media blasting of timing pulley teeth
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: Media blasting of timing pulley teeth
The problem with diesels is they tend to get carbon deposits that can be thick, and nearly impossible to get off without chipping / shot blasting.
The problem deposits tend to be at the other end of the gear (where the valves are, and engine oil drop those deposits).
The other end (the belt / gear side) tends to be quite clean.
Ideally, it would be chemical clean only on the gear side, as you really don't want abrasives left behind that can kill a belt faster than you say boo.
But the other side... hmmm
There may be no way out of this one except chemical.
RE: Media blasting of timing pulley teeth
making people scratch there heads for 40 years ..