What is your method?

Matt Read and Dave Rosenthal, how do you measure the lower thrust clearance on you strokers if you have different clearance upper and lower?
Do you measure with the upper in place, then just reduce the thickness of the lower thrusts by the correct amount?

cheers
michael

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the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates

the lower one has the tab on it to hold it in place, so wouldn't you just leave the upper one out for measuring? or maybe a thin (old) one?

Fit the thrust washers and use a dial gauge.

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What he said ^^

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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.

That is what I do.

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Steve

I fit the new thrusts into the block [not cap] and then measure the total clearance.[dial indicator ]
If it is less than .006-7" then remove the thrusts and and measure the thickness of each thrust[ micrometer .try to keep them the same thickness] and lightly lap the steel back on a flat surface. I use wet and dry on a surface plate[ flat piece of glass will do] Check that the surface is flat.

I use some bearing blue on the crank face and re fit the thrusts and check total clearance. Work out how much more needs to be removed to get the correct clearance. Then rotate the crank. Remove thrusts and see how much of the bronze face is in contact with the crank. Some times it might be just bearing in a localised area if the thrust is not flat.

I then scrape the bronze face at point of contact and repeat the process until it has a good surface contact. Make sure you do not take too much off and end up with too much clearance. If you can not scrape then use some glass paper and CAREFULLY remove the high spots. Do not use wet or dry as it will leave particals is the surface and cause wear.
At this stage you should have a flat uniform bearing surface and thickness of the thrust.
If the clearance is still not enough then take it off the back of the thrust.

Once the block thrusts are OK then repeat with the cap thrusts until you have the clearance on the cap thrusts .006" to .007" more than the block thrusts. IE the total clearance of block thrusts is 6to7 thou plus differencial clearance 6 to 7 thou . This will give a total clearance on the cap of 12 to 14 thou. on the cap thrusts.
This way the block side will take the load before the cap and when the crank flexes [ie bends either side of the bearing] the cap will then start to take some load as well.

Clear as mud

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Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

Nice David, i like the engineer speak.
I will keep that process in mind for my next engine build

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Dean Hutton's first car was a Mini.

feeler gauges work good too

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Thanks to all.

I have a nice little weekend job to do then.

cheers
michael

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the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates