Engine endfloat

[131annika]

My engine has a 0.008" play in crankshaft, if i put new bearings in will this stop the play . as Haynes manual say endfloat is 0.008 to 0.0030in any help please

[Army]

Originally Posted by 131annika

My engine has a 0.008" play in crankshaft, if i put new bearings in will this stop the play . as Haynes manual say endfloat is 0.008 to 0.0030in any help please

I haven't checked the specification in my Volvo manual - be aware some Haynes manuals are crap at converting untis (My Mercedes W123 manual is essentially emergency toilet paper) - so check from a Volvo source to be sure...

...it sounds like you want the specification for the crankshaft end float.

From the data you've given it sounds like it is within spec (but as I say get hold of the spec from a Volvo manual) - so what's the problem?

Kinda makes me want to ask - how are you checking this?

Are you currently rebuilding the engine?

Have you got a bare block with just the crankshaft fitted and the main bearings and caps correctly torqued?

[Whyman]

The end float is the amount the crankshaft can move forward when the clutch is pressed.

New bearings will have no effect on this. There is sometimes a thrust washer that can be replaced.

I once had a Wlosley 6 which were known to have a problem with the thrust washer wearing and then becoming so thin that it fell out and on pressing the clutch the pedal went to the floor. Effectively the crank was pressing against the block and wearing it away. New phosphorus bronze thrust washer made and screwed into place solved the problem.

[omc 47]

Originally Posted by Army

I haven't checked the specification in my Volvo manual - be aware some Haynes manuals are crap at converting untis (My Mercedes W123 manual is essentially emergency toilet paper) - so check from a Volvo source to be sure...

...it sounds like you want the specification for the crankshaft end float.

From the data you've given it sounds like it is within spec (but as I say get hold of the spec from a Volvo manual) - so what's the problem?

Kinda makes me want to ask - how are you checking this?

Are you currently rebuilding the engine?

Have you got a bare block with just the crankshaft fitted and the main bearings and caps correctly torqued?

Saw this request post earlier and first thought was throw the Haynes book in the bin and research from the Green Volvo ref' books.
B18/20 engines fluctuate but 0.007"-0.0042" is familiar, as Army says are you rebuilding..is the engine on the bench...what other wear measurements are there?
So many unknowns, just changing the Main Bearing set to satisfy a tolerance is bad engineering practice.
lf the engines in one piece...................enjoy it, they don't wear out as fast as many engines out there.

[142 Guy]

According to my 1971 140 Volvo workshop manual the permissible end float for a B20 crankshaft (you did not specify B18 or B20) is 0.0018" to 0.0054" (0.47 - 0.137mm). If you have a B20 and your measurement is accurate then you have excessive clearance.

Are you using a dial gauge to measure crankshaft movement or is the engine out and you are using a feeler gauge between the crankshaft and the rear thrust face?

The rear main bearing has flanges on it which form a thrust face for the crankshaft. Presumably if the clearances are excessive you have wear on that bearing thrust face or wear on the matching face on the crankshaft (less likely). The factory service manual is devoid of any guidance on addressing excessive clearance. The B20 does not use a thrust washer to establish the correct clearance so it looks like new main bearings are your only option if you want to fix it.

Before doing anything I would make sure you have an accurate measurement.

[IainG]

Hi

0.0018" to 0.0054" (0.47 - 0.137mm)

Think the "larger" inch is out by a factor of 10 if the metric measurement is correct.
should it be 0.018" to 0.0054" ?

Does that then mean the reading 0.008" is in tolerance?
Iain

[omc 47]

Originally Posted by Whyman

The end float is the amount the crankshaft can move forward when the clutch is pressed.

New bearings will have no effect on this. There is sometimes a thrust washer that can be replaced.

I once had a Wlosley 6 which were known to have a problem with the thrust washer wearing and then becoming so thin that it fell out and on pressing the clutch the pedal went to the floor. Effectively the crank was pressing against the block and wearing it away. New phosphorus bronze thrust washer made and screwed into place solved the problem.

Triumph 2.5 engines had similar thrust washer issues but Volvo B18/20 engines have the trust bearing built into main bearing shell so don't suffer many of the british design issues..........
Your info and experience does not relate to Volvo engines which are a more superior design in many ways.
Having rebuilt British and Swedish my money is on the latter....

[Whyman]

Originally Posted by omc 47

Triumph 2.5 engines had similar thrust washer issues but Volvo B18/20 engines have the trust bearing built into main bearing shell so don't suffer many of the british design issues..........
Your info and experience does not relate to Volvo engines which are a more superior design in many ways.
Having rebuilt British and Swedish my money is on the latter....

I agree with you on this and it is borne out by BL being no more and Volvo still going very strong in the world market.

[142 Guy]

Originally Posted by IainG

Hi


Think the "larger" inch is out by a factor of 10 if the metric measurement is correct.
should it be 0.018" to 0.0054" ?

Does that then mean the reading 0.008" is in tolerance?
Iain

My 'flying fingers' error. 0.0018" - 0.0054" is correct as per the service manual. I missed a '0' on the tight end of the metric measurement which should have been 0.047mm.