15 replies to this topic

[andymini12]

Hi
I have stripped my 998 engine down and got the crank out, it does not seem to be in that bad condition.
I have read about people not regrinding there crank if it is alright condition can you do this?
Im thinking to get it reground anyway as it seems a thing not to miss in a engine rebuild.
Also how much should a crank regrind be?
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Thanks Andy

[zef]

Well the pic's aren't perfect but on the basis of what I can see I'd just reshell it and use it.

Edited by zef, 06 December 2011 - 08:15 PM.

[Artful Dodger]

see about getting it polished. gets rid of all of the tiny engravings in the crank bout hardly reduce the size.

[Frisco]

Run your finger nail across the journals and if it gets cought on anything the crank needs a regrind. If it seems good after that get some plastigauge and check the tolerences.
Its cheap to do.

[andymini12]

I have already run my finger nail over all of the journals and it does not get caught on anything.
What is plastigauge?
Thanks Andy

[mini-luke]

They are clever gauges that when crushed in the journal will give an indication of the clearances.

[racingbob]

get it professionaly checked mine looked not to bad but it did need a grind when
when saunders engineering checked it out

[andymini12]

Yeah i think i will,
How much will a crank regrind be?
Also i have heard good things about dartford rebore, so i am thinking of taking it there?
Andy

[R1minimagic]

Why dont you measure the journals and see if they are still in spec?

[Frisco]

Easiest way to explain plastigauge.



Ignore the geek doing it and the fact that its a v8 in the vid the procedure is the same. Its cheap,really easy and gives a very good reading of the clearance.

A machine shop will no doubt do it for you quicker but I suppose I like doing things myself

[andymini12]

Thanks for that,
can you also messure the journal with a micrometer?

[R1minimagic]

Yes if you have one

[andymini12]

Yes i will do, waiting for it to come,
What should the messurment be?
is this right?
main bearing 2.0005-2.0010in

big end's 1.7504-1.7509in

[bmcecosse]

It looks fine to me - if the journals were worn there would also be some scoring> Check with micrometer by all means but I would just reshell it.

[Ethel]

I'd kind f go with bmcecosse, if it looks good it probably is. If you're really interested in doing a tip top job then it'd be best taking it to a machine shop. The journals can measure up with the thickness within tolerance but it won't tell you if they a perfectly round or parallel/congruent to the other journals. The only way to check that is to centre & turn the crank, with a dial gauge running on the journals.