Hi all!

Started the fun stuff tonight and immediately hit a snag! installed the crankshaft and when I checked the end float it was 0.039"! Apparently the end float was set up by the machine shop to 0.006"! Measured the thrust washers and the bottom ones were 0.092" and top was 0.095". Something is up! Any ideas?!

cheers
Steve

Many years ago when i was 18 i had an engine replacement in my 1964 Cooper due to end-float getting so rattly. My first big Mini

I hope your get a better answer...

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..still waiting for the Italian Job sequel to see if the bus went down

Me thinks you've got a std set of thrust washers.
You'll need + .030" over size, which I believe a getting hard to get, to get you into the ball park!

Doc will be on here tomorrow to maybe point in the right direction for finding them.

Cheers Shane


What size engine are you building? Is it std or do you plan to rev it a little.more?

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If it's not a Cooper S, the mini was designed to be modified!

Std, +.003", and +.030" ACL thrusts for a 1275 are still made here and are NOT hard to get. Contact Karcraft (karcraft.com.au), or Lindsay Seibler (minis.com.au), or Mini King, or minisport.com.au

If you are building a smallbore though you may need to get some thrusts modified (silver soldering shim steel onto the steel backing is one way out).

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

after much fiddling managed to get a 0.004" end float. Is that enough? It's a 1275 bored 40thou with a pretty lumpy cam...not going to be driving it that hard, just the occasional spirited drive! Also...while I'm on the subject, need a slot drive oil pump that'll fit into a cooper s block...will I have to drill and tap the block?! thanks for all the replies!

.004" is not enough you want .006" or more. Don't ask how I know this...
[edit] I'm assuming you checked endfloat with a dial gauge. If you used feeler gauges it probably has a thou or 2 more clearance than you think.

Sand a little off the back (steel side) with a sheet of 180 wet/dry paper and a flat plate or sheet of glass.

Yes you will have to tap 1 hole, the slot drive pumps use only 2 bolts, in a diagonal array.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

bugger!! ok, excuse my ignorance but can I remove the center main cap with the crank and pistons in place?! I thought 0.004" would be enough end float so assembled the pistons etc.! Thanks again!! Novice engine builder here...would be completely lost without the forums!

sure no prob.
make double sure the thrusts fit the right way, bronze faces out <->

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

All sorted!! After a fair bit of trial and error ended up with a 0.006" end float!! All thrusts in the right way! really enjoying the build!! Setting the cam timing next!! Thanks again for the help! Steve

re oil pump, yes drill and tap the block plug the old hole, locktight a bolt in there and grind flush

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A good friend will come and bail you out of jail...but a true friend will be sitting next to you saying "Damn...that was fun!"

I have a sneaking suspicion I didn't do this when I converted my last 1275 to two bolt pumps... Although I am wondering how I got away with it given the bolt hole goes into the water jacket right?

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

NVM, the gasket seals it. I always thought it was a blind hole there, because if the bolts are too long they bottom out.

[edit] goes to check Mk2S block...
That hole is blind in this one. But the S pump's top hole isn't.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

when i put the air blower in this hole the air went passed inside the block , not sure if was into a water jacket but i pluged it up to be safe.

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A good friend will come and bail you out of jail...but a true friend will be sitting next to you saying "Damn...that was fun!"