6 replies to this topic

[unburntfuelinthemorning]

What size feeler gauge should I be able to get under the main and big end bearing caps when checking bearing crush on a 998?

[mini13]

your looking for about 3 thou

[unburntfuelinthemorning]

Thanks for replying.  I've read elsewhere that I need 4 to 5 thou so I thought I'd ask here.  I have 7 thou on the big ends but only 3 thou on the mains so was concerned that I may need some align-honing work doing as the last thing I need is a spun bearing.  If you're right about 3 thou that's great.

[Spider]

0.007" at the top end and 0.003" at the very bottom end - even at that, I'm be doing a few 'hail merrys'.

 

You'll get a more accurate result using a DTI rather than a feeler gauge.

 

If you are chasing that last 0.0005", you can give the cap and sump rails a rub on an oil stone, just to polish them, don't go ape.

[unburntfuelinthemorning]

Are you saying 0.003" is the lower limit?

 

How do you position the DTI gauge?

[Spider]

Are you saying 0.003" is the lower limit?

 

How do you position the DTI gauge?

 

Yes, 0.003" is the lower limit.

 

You can usually find a a point on the spot facing of the cap to get the finger in. I find the small (true) DTI is better for this than a Dial Gauge as it can be set to right angles (or just about any angle) to the workpiece.

 

One like this ;-  https://www.msi-viki...mm_p_22277.html

 

ideally, you want it on the centre line of the bolt, but there's not usually enough space there when a socket is also landed over the bolt head so as close as you can get to that.

[unburntfuelinthemorning]

Thanks for the information.