Rollmaster timing gear


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By lowrider - 15 Years Ago
Wanted to go to a bigger cam and install my Rollmaster timing set to see how my 57 would respond. Got done, it ran good and sounded good. The only thing I didn't like was you couldn't hear yourself think while you were cruisin down the road (I must be getting old).  So I decided to reinstall my old 270 cam from Mummert. When I took the cam thrust plate off, there was a nice groove about 1/16in. deep on the side facing the camshaft. The cam was OK, just a groove in the plate. I'm sure I put the spacers in correctly and even looked at my 57 shop manual just to make sure. The thing I didn't do was check the camshaft end play (what could go wrong). Looking at a stock cam gear and the Rollmaster gear there's a difference of about 1/16in. in width where it slides on the camshaft between the two, just about the depth of the groove in the thrust plate. Any ideas on what I might have done wrong? Anyone run into this before?
By aussiebill - 15 Years Ago
lowrider (5/2/2010)
Wanted to go to a bigger cam and install my Rollmaster timing set to see how my 57 would respond. Got done, it ran good and sounded good. The only thing I didn't like was you couldn't hear yourself think while you were cruisin down the road (I must be getting old).  So I decided to reinstall my old 270 cam from Mummert. When I took the cam thrust plate off, there was a nice groove about 1/16in. deep on the side facing the camshaft. The cam was OK, just a groove in the plate. I'm sure I put the spacers in correctly and even looked at my 57 shop manual just to make sure. The thing I didn't do was check the camshaft end play (what could go wrong). Looking at a stock cam gear and the Rollmaster gear there's a difference of about 1/16in. in width where it slides on the camshaft between the two, just about the depth of the groove in the thrust plate. Any ideas on what I might have done wrong? Anyone run into this before?

Havent heard of any rollmaster problems but is the correct spacer on the camshaft? it should have chamfer on inside facing cam journal, easy to mistakenly fit parrallel outer spacer. havent got cam etc in front of me but worth checking. best regards bill.

By lowrider - 15 Years Ago
Think I've got it figured out. Put it together with the stock gear and it had the right end play. Then I reinstalled the Rollmaster gear (what a pain) checked the end play and had too much again. Took the front spacers off and I think I didn't have the outer spacer with the keyway installed right. Made sure the keyway lined up and ended up with the right end play. I either missed the keyway or didn't have the gear all the way on the first time. My mistake. Thanks for the input Bill.
By aussiebill - 15 Years Ago
lowrider (5/2/2010)
Think I've got it figured out. Put it together with the stock gear and it had the right end play. Then I reinstalled the Rollmaster gear (what a pain) checked the end play and had too much again. Took the front spacers off and I think I didn't have the outer spacer with the keyway installed right. Made sure the keyway lined up and ended up with the right end play. I either missed the keyway or didn't have the gear all the way on the first time. My mistake. Thanks for the input Bill.

Dan, glad it worked out ok. With the early rollmaster sets, the Nitrided versions were very tight on the crankshaft due to the treatment and required polishing to make fit easier, i dont know if this as rectified with later sets, ted may know. best regards bill.

By Ted - 15 Years Ago

The Rollmaster sets being tight on the camshaft snout has been an ongoing problem with many of the early sets.  I typically just have to hone them slightly for some additional clearance.  I haven’t had the opportunity to use any of the new sets since Rollmaster production started back up so I can’t say if that particular problem has been corrected.

 

The camshaft end play is essentially dictated by the difference in the chamfered spacer and thrust plate thicknesses.  Endplay measurement I aim for is 0.004”-0.006”.  The chamfered spacer is the one that has to be slightly thicker so that adequate end play is maintained.  And the chamfer has to face towards the back of the engine or there will be too much camshaft end play clearance.  And too tight of course creates other problems including galling.