blackbird939
New member
- Joined
- Sep 8, 2015
- Location
- Orlando
I have a question about how cam end play is set. Just to understand how it works. Here's what I can get from looking at it all.
The cam sprocket 'hub' has a machined surface on the front and rear, the rear being the most critical. The rear face of the sprocket will interfere with the steel spacer ring when torqued down. This allows the cam sprocket to be tightened and locked into place on the cam.
So, the steel spacer ring, when installed, must be proud of the surface of the the thrust plate by the min/max end play spec. - The difference between the protrusion of the ring past the thrust plate determines the end play. Right? I know there are other factors, like the cam sprocket backlash and alignment of the gears. Those two are within allowable values. However, there's a very tiny step there where the spacer ring has eaten a bit of the steel cam sprocket. I think this was caused by the excessive end play in my B20, 2MM-4mm maybe. Tossed the old brass thrust plate, warped and heavily gouged. Bought a new steel one from IPD. So, now, there is NO end play when torqued down. The sprocket is just touching the thrust plate.
I can either spend another $550 on another set of steel gears, but these are fine, just a small step where the steel ring has etched the rear face of the sprocket. I could shim the spacer ring, have a new taller one made, or mill the thrust plate.
Suggestions?
The cam sprocket 'hub' has a machined surface on the front and rear, the rear being the most critical. The rear face of the sprocket will interfere with the steel spacer ring when torqued down. This allows the cam sprocket to be tightened and locked into place on the cam.
So, the steel spacer ring, when installed, must be proud of the surface of the the thrust plate by the min/max end play spec. - The difference between the protrusion of the ring past the thrust plate determines the end play. Right? I know there are other factors, like the cam sprocket backlash and alignment of the gears. Those two are within allowable values. However, there's a very tiny step there where the spacer ring has eaten a bit of the steel cam sprocket. I think this was caused by the excessive end play in my B20, 2MM-4mm maybe. Tossed the old brass thrust plate, warped and heavily gouged. Bought a new steel one from IPD. So, now, there is NO end play when torqued down. The sprocket is just touching the thrust plate.
I can either spend another $550 on another set of steel gears, but these are fine, just a small step where the steel ring has etched the rear face of the sprocket. I could shim the spacer ring, have a new taller one made, or mill the thrust plate.
Suggestions?