998/1098 crank thrust washer clearance

[AndyB72]

I'm starting to build the mild/fast road overbored 1098 engine for the surf blue Mini and as I haven't put an engine together for several years expect some daft question from me other the next few weeks.

I'm getting 6 thou crank end float on a set of new standard thrusts, it that too much or should I be ok? As oversized thrusts are NLA correcting the clearance could be very tricky.

[goff]

Andy , Clearance should be around 2-3 thou , the Machine shop at Bawtry i was telling you about ( Stanwood Engineering ) got me over size ones and machined them to fit, if you have to much end float , you will have problems getting the clutch to disengage ,
Hope this helps and stay safe .

Goff

[whistler]

Oversize thrusts are available from Somerfords. I bought some recently to get back to 4 thou clearance. I bought the plus 5 thou ones but only fitted 1 pair.

[AndyB72]

Oversize thrusts are available from Somerfords. I bought some recently to get back to 4 thou clearance. I bought the plus 5 thou ones but only fitted 1 pair.

Were they small bore thrusts, MiniSpares sell +5 1275 ones, I'll have a nosey on their site.

[Spider]

I know the book says 2 - 3 thou clearance on these, but IMO, that's a little tight.

On these smaller engines, I aim for 3 - 4, but, if it's going to be a screamer, the 4 - 5.

[Dearg1275]

Andy , Clearance should be around 2-3 thou , the Machine shop at Bawtry i was telling you about ( Stanwood Engineering ) got me over size ones and machined them to fit, if you have to much end float , you will have problems getting the clutch to disengage ,
Hope this helps and stay safe .

Goff

To me that just means you have 4 thou unusable clutch plate as it wears out. I’ve seen clutch plates run right back to the rivets so clutch adjustment can take care of this degree of tolerance. The difficulty with clutch throw comes from all the worn parts of the linkage before you get to the clutch plate itself.

I’m running 6thou clearance on my 50bhp 850 with no clutch problems whatsoever.

D

[timmy201]

ACL make them in
STD
+003
+005
+015
+030

https://classicmotoring.net.au/thrust-washers/

[AndyB72]

Thanks I've sent them an email to see if they can ship to the UK.

[timmy201]

If not, I can post them over for you. Just let me know

[AndyB72]

Thanks very much I might take you up on that offer, at the moment it looks like MED stock them, will see how I get on.

Another question, which side of the main cap should the thicker thrust washers go?

[AndyB72]

Makes sense.

[AndyB72]

The thrusts have arrived from MED. Which side of the cap should I fit the thicker thrusts?

[Spider]

It's pretty much academic but I tend to fit the thicker pair on the back of flywheel side.

[Vegard]

It's pretty much academic but I tend to fit the thicker pair on the back of flywheel side.

So do I, but it does not matter onw blind bit