Just measured end float off of the crank on my 850 Mk3 rebuild and it came out at 80 thou. Brand new superblends in. I know I need to get it down to about 20 thou but putting 60 thou of shims in seems excessive. I don't remember seeing any shims when I pulled the engine apart. Your views
If you need to add shims y…
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Previously mike_steer wrot…
Previously mike_steer wrote:
Just measured end float off of the crank on my 850 Mk3 rebuild and it came out at 80 thou. Brand new superblends in. I know I need to get it down to about 20 thou but putting 60 thou of shims in seems excessive. I don't remember seeing any shims when I pulled the engine apart. Your views
Hi Mike
I had an end float problem on my 850 mk3 being excessive
I cant remember how far out it was out of the recommended limit which should be between .005"/.015" but had to manufacture my own shims from steel/brass shim stock as the club shims are only .003"thick
good luck steve
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Previously steve_elston wr…
Previously steve_elston wrote:
Previously mike_steer wrote:
Just measured end float off of the crank on my 850 Mk3 rebuild and it came out at 80 thou. Brand new superblends in. I know I need to get it down to about 20 thou but putting 60 thou of shims in seems excessive. I don't remember seeing any shims when I pulled the engine apart. Your views
Hi Mike
I had an end float problem on my 850 mk3 being excessive
I cant remember how far out it was out of the recommended limit which should be between .005"/.015" but had to manufacture my own shims from steel/brass shim stock as the club shims are only .003"thick
good luck steve
Steve thanks. I will machine my own shims for this project this week sometime. Did you make one shim or did you divide the end float between the two bearings, in my case 30 thou each side. I know the key way has to taken into consideration.
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Previously mike_steer wrot…
Previously mike_steer wrote:
Previously steve_elston wrote:
Previously mike_steer wrote:
Just measured end float off of the crank on my 850 Mk3 rebuild and it came out at 80 thou. Brand new superblends in. I know I need to get it down to about 20 thou but putting 60 thou of shims in seems excessive. I don't remember seeing any shims when I pulled the engine apart. Your views
Hi Mike
I had an end float problem on my 850 mk3 being excessive
I cant remember how far out it was out of the recommended limit which should be between .005"/.015" but had to manufacture my own shims from steel/brass shim stock as the club shims are only .003"thick
good luck steve
Steve thanks. I will machine my own shims for this project this week sometime. Did you make one shim or did you divide the end float between the two bearings, in my case 30 thou each side. I know the key way has to taken into consideration.
Hi Mike
I'm certain that I centralized the crankshaft by shimming both sides , The shims/spacers I made were just placed between the main bearing outer and crankcase inner faces like the original spec ( roughly 2.75"o/d x 2.25" i/d x whatever thickness you require)
I wouldn't put all the shim on the timing side although the timing gears are straight cut and the timing not effected, it may put stress on the cam chain by being mis-aligned
it may be worth putting a steel rule across the cogs
good luck steve
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Previously steve_elston wr…
Previously steve_elston wrote:
Previously mike_steer wrote:
Previously steve_elston wrote:
Previously mike_steer wrote:
Just measured end float off of the crank on my 850 Mk3 rebuild and it came out at 80 thou. Brand new superblends in. I know I need to get it down to about 20 thou but putting 60 thou of shims in seems excessive. I don't remember seeing any shims when I pulled the engine apart. Your views
Hi Mike
I had an end float problem on my 850 mk3 being excessive
I cant remember how far out it was out of the recommended limit which should be between .005"/.015" but had to manufacture my own shims from steel/brass shim stock as the club shims are only .003"thick
good luck steve
Steve thanks. I will machine my own shims for this project this week sometime. Did you make one shim or did you divide the end float between the two bearings, in my case 30 thou each side. I know the key way has to taken into consideration.
Hi Mike
I'm certain that I centralized the crankshaft by shimming both sides , The shims/spacers I made were just placed between the main bearing outer and crankcase inner faces like the original spec ( roughly 2.75"o/d x 2.25" i/d x whatever thickness you require)
I wouldn't put all the shim on the timing side although the timing gears are straight cut and the timing not effected, it may put stress on the cam chain by being mis-aligned
it may be worth putting a steel rule across the cogs
good luck steve
Steve again thanks. Its what I'd like to do and makes logical sense to shim each side. However from an engineering point of view that might not be the case. Ill put a general post on here and see what the replies are. Probably very contrasting, all one side or equally split, lets see.
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If you need to add shims you might as well go to 3 to 5 thou endfloat which has worked for me on many different engines fitted with floating cranks, fit them behind the bearing inners next to the crank and they will not move, minimise the number of shims by starting with the thickest one available. Make sure you check for the parts on the crank mainshaft journals fit when shimmed and there is no clashes say between a woodruff key and a seal, so it may be better to put all the shims on one side instead of equally which may need thinner shims.