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?
998 Bearing Crush
#1
Posted 25 April 2019 - 02:28 PM
#2
Posted 25 April 2019 - 02:50 PM
your looking for about 3 thou
#3
Posted 25 April 2019 - 07:03 PM
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.
#4
Posted 25 April 2019 - 08:24 PM
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.
#5
Posted 25 April 2019 - 08:52 PM
Are you saying 0.003" is the lower limit?
How do you position the DTI gauge?
#6
Posted 26 April 2019 - 01:18 AM
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.
#7
Posted 26 April 2019 - 08:30 AM
Thanks for the information.
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