21 replies to this topic

[DEXISWOLF]

Hiya im wondering ive measured my crank endfloat on one side i get 9 thou and other i get 7 so does that make 16 thou endfloat , im measuring off bothe sides of the center main bearing and by gently prising with a flatblade off the cap so just wondering if im doing it right :)

[blacktulip]

I think your meant to lever the Crank fully to one side (do not lever anywhere near the bearings) then measure the end float at the end with the gap.

Edited by blacktulip, 07 September 2016 - 09:38 PM.

[Dusky]

You should measure it as above. Push crank ( lever) to one side, then put the dti on. Then you lever to the other side and read the DTI.
However, the endfloat should be a lot smaller. aim for 2-3 thou on the road.

[Cooperman]

The end float as quoted in both the original BMC Workshop manual and the Haynes manual is between 0.002" and 0.003".

[DEXISWOLF]

Ahh right i see i was trying to find out wich side you measure, on the thrust washer closest to the flywheel (the one on the left looking from the front of the engine) i get 9 thou so what size thrusts do i need :s , minispares list 3 thou and a 30 thou

[Spider]

Are you measuring it with new thrusts or old ones?

 

Ideally for a road engine you'd want 0.003 - 0.005"

[DEXISWOLF]

They was new about 3000 miles ago but a gearbox later has engine in bits again there is light scoring on them but nothing heavy so i was thinking they would do job of a starting point or do you reckon there past it and i should get another set of standards to test first

[Spider]

They was new about 3000 miles ago but a gearbox later has engine in bits again there is light scoring on them but nothing heavy so i was thinking they would do job of a starting point or do you reckon there past it and i should get another set of standards to test first

 

Gee, seems somethings not right that they seemed to have worn so much in 3000 miles, assuming they were right then.

 

If the true end float you're measuring is 0.009" you'd want to reduce this by 0.004 to 0.006", so that's the oversize thrusts you would need.

 

I think Cooperman mentioned the other week that the Thrusts he got from Mini Spares while listed as 0.003" where in fact 0.003" per side, so a set would give 0.006". I'm not sure which ones from Mini Spares he was buying, they have a couple of different ones.

 

by the way, Here's Mahle's advice on Crank End Float;-

 

[DEXISWOLF]

Cheers :)

[Cooperman]

As promised last week, I have just measured a standard and +0.003 thrust. Both are new and unused.

The part numbers are 'GS1231L' and 'GS1231L 003'

 

The GS1231L is 0.091" thick and the GS1231L 003 is 0.094"

 

That means that any end float of up to 0.009" can be returned to recommended limits (0.002" to 0.003") by using a combination of these.

 

More than 0.009" float will require a set of 0.030" ground back to the required thickness.

[Carlos W]

Get a set of new standard thrusts and measure again.

 

how are you measuring?

[DEXISWOLF]

Im gunna get a set of 3 thous tomorrow and il report back with the meausurements,

Im meausuring using the dti way and feeler gauge way i was getting the same results with both ways, i was gently prising the crank both ways and meausuring both sides of the center cap with the thrusts with feeler gauges and also by putting the dti on the end of the flywheel end of the crank

[Cooperman]

You are measuring the linear float of the crankshaft. So the 'float' is how far the crank moves from one extreme to the other. You can't measure 'each side' because there is no each side.
Just press the crankshaft as far as it will go one way and either measure the gap between the crankshaft face and the thrust bearings on the 'slack' side, or set a DTI to zero against a crank Web and read what the DTI reads when the crankshaft is pushed as far as it will go the other way

[DEXISWOLF]

Oh right thats what was confusing me i didnt know if you measured both or just one but either way i got 9 on one side and 7 on the other

[Cooperman]

I don't think I understand what you have been measuring. There is no 'one side' or 'both sides'. All you are able to do is push the crankshaft firmly against one set of thrusts and measure the gap, which is the float, between the crankshaft thrust face and the other set of thrusts. That measurement is the amount of float the crankshaft has.