Hoping someone has the answer as my emails to Chaffins are not getting answered.
I have the cam thrust kit for reground early cams. Taking into account the gasket thickness, I require 3,3mm or 0.130"
The two steel thrust washers which sandwich the brass thrust washer are 1.2mm or 0.047" each so if I adjust the final thickness using the brass thrust washer I will need 0.9mm or 0.035" which is going to mean shaving off most of this washer.
Now, is this normal? Why would Chaffins supply a 3,6mm ~ 0.142" thick brass washer if you need to shave 75% away?
So, could I not eliminate the two steel washers and use just the brass washer (shaving only 0.3mm off) ?
I'm not the smartest tool in the shed, nor is my math very good, but what am I missing here?
I understand the need for the thrust kit, and I definitely have a large gap to fill, but what do you guys do?
Hey Justin, sounds like you do need it, just not very much of the brass washer. I would suggest putting 1 steel washer against the cam nut, and then shaving the brass washer down to take up the remaining space. The force from the cam nut is on such a small area that I think the brass washer alone would wear too quickly. But the brass washer should be ok to just sit still against the cover plate. What does the backside of your cover plate look like?
I will say that on my engine with my old cam and timing gear, I ended up using the two steel washers and the brass washer without any modification and it fit perfectly - so I was glad the brass washer was as thick as it is.
Thanks Seth, thats why I like the forum. Quick responses.
The back of my cover has a lip where the felt sits behind, so it looks like the brass will wear against this lip.
Now I'm thinking of shaving the lip off smooth and (gaining) that distance so I can use both steel washers and a not-so-thin brass washer.
I'll shoot for the 0.002-0.005" clearance on final fit.
Thanks again Seth,
No problem! I don't always have answers for folks but I try to answer whenever I see something I know anything about. Usually, if you're to the point where you've asked the question on the forum, you've exhausted all other immediately available resources, and the sooner you get an answer on here the sooner you can get back to foolin' with Liz. =)
I was going to say if you don't mind shaving things a bit you can probably smooth out your cover plate some and look at thinning your cam nut some too. That will probably give you the room you need to get all 3 pieces in there with as little work as possible. I put a BUNCH of miles on mine and there was hardly any wear when I swapped it out for a .280 cam and new timing gear.
You make a good point. I'll take the measurements again and see what I can do.
I used a set with one of Bill Stipes large bearing cams and adjustable cam gear. Turns free without gasket and no for/aft movement. Installed gasket and only moved a few thousands of and inch. Perfect! Love the cam and gear. Hopefully I re-sized photos OK.