Large shim requirement

[iSpyder]

Continuing with the 60k service on my car and have found that the valve worksheet is calculating that I need extremely large shims. Is this unusual? I have a few that run in the range of 2700 all the way up to 2775. Just want to see if this possible or maybe I am doing something wrong in the gap measurement. I did double and triple check these measurements and kept getting the same thing.

 

[sdpatt]

Regarding the question as to whether you are doing it right, the answer is in the final "Gap - As Left" measurement. If the gap is in the designed range, the shim is the right one. I have a small number of the thicker shims, but the .05mm sizes were purchased through a Yamaha supplier since all the Motorcraft part numbers are obsolete.

Size (mm), Yamaha P/N, Number On Hand
2.700, K&L 13-7649, 4
2.725, N/A, 1
2.750, K&L 13-7650, 5
2.775, N/A, 1

 

[yamahaSHO]

I have a few 2750's in my motor, however, I have new valves, seats, and cams.

 

[iSpyder]

Hey Scott,

Thanks for the info. I guess I won't have the answer until I am able to replace them with the estimated shim. But for the ones that were calculating to be a larger shim and I had on hand (2600 & 2650), the final gap measurement was within spec. So I guess i am doing something right.

Maybe I misread what you wrote but are you saying you have some of these larger sizes for sale? If not I figured I could go down to the Yamaha dealership near my house and see what they have. I guessing these are something they would probably have to order?

Thanks!

 

[iSpyder]

I have a few 2750's in my motor, however, I have new valves, seats, and cams.

Thanks Jason! My engine compartment looks NOTHING like yours and the car completly stock. Matt from ShoBros (were I rented the kit) wondered if I had different cams in there but I don't. Is it possible that not have doing this procedure at 60k have caused this huge gap?

 

[Racer X]

You're not doing anything wrong. I just did my adjustment, and I could have used some 2600 and 2700 sizes to bring things to the tight end of the spec (or even nominal in one case). ****, one of the stock shims was a 2625.

 

[jedhead]

Hey Scott,

Thanks for the info. I guess I won't have the answer until I am able to replace them with the estimated shim. But for the ones that were calculating to be a larger shim and I had on hand (2600 & 260), the final gap measurement was within spec. So I guess i am doing something right.

Maybe I misread what you wrote but are you saying you have some of these larger sizes for sale? If not I figured I could go down to the Yamaha dealership near my house and see what they have. I guessing these are something they would probably have to order?

Thanks!

When Matt and I went to a Yamaha dealership to pick up some shims, they just handed us a box full of shims and told us pick out the ones we needed. I do admit that I like the puzzled look on their face when we told them they were for a 3.0 liter Yamaha V6.

Bob

 

[97SHOgt]

When Matt and I went to a Yamaha dealership to pick up some shims, they just handed us a box full of shims and told us pick out the ones we needed. I do admit that I like the puzzled look on their face when we told them they were for a 3.0 liter Yamaha V6.

Bob

But they do work correct? I was thinking about doing this because I heard elsewhere they were the same. How much did they charge you out of curiosity?

 

[jedhead]

But they do work correct? I was thinking about doing this because I heard elsewhere they were the same. How much did they charge you out of curiosity?

They are in my engine now. I paid $5 ea. for the shims I needed plus I bought some extra for our shim kits.

Bob

 

[97SHOgt]

They are in my engine now. I paid $5 ea. for the shims I needed plus I bought some extra for our shim kits.

Bob

Nice. Just what I needed to hear.