Hi guys,
I did my valve check this weekend on my 04' and while most valves were within spec, I found 2 that were a bit loose so I decided to change out their shims. Both happened to be on the left side and so I only removed the cams on the left. I was a bit surprised to find the following on the intake and exhaust cam bearing surfaces. Pics 1 and 2 are from the intake and exhaust cams bearing surfaces. Pic 3 is from one of the other cam bearing surfaces that looked perfectly normal. Both pics 1 and 2 are from cylinder #3 on the left rear side.
I was quite surprised to see the obvious wear marks, not to mention the obvious 2 divots in the cam surface! I have never dropped these cams and to my knowledge nothing has ever struck them to the point that this kind of mark would have been made, let alone one on each cam!
So, the questions are: Is this an obvious defect in the metal? Will the surface of the cam bearing just get worse and what could I possibly do to even fix it? It appears that these surfaces just ride on the aluminum surface of the head and don't have their own bearing inserts. So is it just going to get worse and cause the cam to get loose and the tolerances to get sloppy?
Anyone else ever notice this kind of wear on cyl #3?????
Coincidently, the two shims I changed just happened to be one exhuast on cyl #3 and one intake on cyl #3! But the other two valves were in spec still!
Bike has about 32,000 miles so far.
Hal #309
I did my valve check this weekend on my 04' and while most valves were within spec, I found 2 that were a bit loose so I decided to change out their shims. Both happened to be on the left side and so I only removed the cams on the left. I was a bit surprised to find the following on the intake and exhaust cam bearing surfaces. Pics 1 and 2 are from the intake and exhaust cams bearing surfaces. Pic 3 is from one of the other cam bearing surfaces that looked perfectly normal. Both pics 1 and 2 are from cylinder #3 on the left rear side.
I was quite surprised to see the obvious wear marks, not to mention the obvious 2 divots in the cam surface! I have never dropped these cams and to my knowledge nothing has ever struck them to the point that this kind of mark would have been made, let alone one on each cam!
So, the questions are: Is this an obvious defect in the metal? Will the surface of the cam bearing just get worse and what could I possibly do to even fix it? It appears that these surfaces just ride on the aluminum surface of the head and don't have their own bearing inserts. So is it just going to get worse and cause the cam to get loose and the tolerances to get sloppy?
Anyone else ever notice this kind of wear on cyl #3?????
Coincidently, the two shims I changed just happened to be one exhuast on cyl #3 and one intake on cyl #3! But the other two valves were in spec still!
Bike has about 32,000 miles so far.
Hal #309
Attachments
-
237.9 KB Views: 225
-
229.5 KB Views: 217
-
193.6 KB Views: 193