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Engine Specific Info and Questions => IDI Engine => Topic started by: Spokerider on January 11, 2014, 08:53:05 pm

Title: AAZ main bearing bolts
Post by: Spokerider on January 11, 2014, 08:53:05 pm

I'm doing an aaz crank nose repair [ AHU sprocket ] on a newly rebuilt engine with zero run time. This means I will be re and re the crankshaft. Can I reuse the main bearing bolts? Or are they a one time use stretch bolt?

This is not a high-pro rebuild, just keeping it in stock form.

I do have and will be using new connecting rod stretch bolts however.

Thanks.

Title: Re: AAZ main bearing bolts
Post by: theman53 on January 11, 2014, 09:09:52 pm

They should be the 80mm long fully threaded IIRC and yes they are one time use.

Title: Re: AAZ main bearing bolts
Post by: Spokerider on January 12, 2014, 08:25:05 am

Thank you.

I'll order them.

Title: Re: AAZ main bearing bolts
Post by: libbydiesel on January 12, 2014, 08:37:25 am

There are two different sizes of AAZ main bearing cap bolts. 

Title: Re: AAZ main bearing bolts
Post by: theman53 on January 12, 2014, 10:08:50 am

For some reason I thought I was replying to the AHU thread...yes there were partially threaded 65mm long and the 80mm long full thread. IIRC the 65 are reusable, but the 80mm long are not.

Title: Re: AAZ main bearing bolts
Post by: libbydiesel on January 12, 2014, 10:15:05 am

...and in either case I'd go with studs...

Title: Re: AAZ main bearing bolts
Post by: Spokerider on January 12, 2014, 08:24:15 pm

Quote from: libbydiesel on January 12, 2014, 10:15:05 am

...and in either case I'd go with studs...

even for a" stock" engine......any appreciable benefit over oem vw bolts?

Title: Re: AAZ main bearing bolts
Post by: theman53 on January 13, 2014, 05:36:33 am

Quote from: Spokerider on January 12, 2014, 08:24:15 pm

Quote from: libbydiesel on January 12, 2014, 10:15:05 am

...and in either case I'd go with studs...

even for a" stock" engine......any appreciable benefit over oem vw bolts?

Yes.

You can reuse them for sure, but the main benefit is that it will hold onto your main caps better. 2 or 3 guys here have cracked their main cap during normal operation.

Title: Re: AAZ main bearing bolts
Post by: Spokerider on January 13, 2014, 08:46:46 am

http://www.ebay.com/itm/ARP-MAIN-STUDS-VW-RABBIT-GOLF-JETTA-1-8L-2-0L-204-5402-/300625447233?pt=Race_Car_Parts&hash=item45feac4941&vxp=mtr

Is this what I require for an aaz?

Thanks.

Title: Re: AAZ main bearing bolts
Post by: theman53 on January 13, 2014, 05:22:08 pm

I don't know. IIRC the bolts are M10-1.5x 65mm or 80mm so the studs would be the same only much longer like 100mm

Title: Re: AAZ main bearing bolts
Post by: Mark(The Miser)UK on January 14, 2014, 08:08:52 am

Why are studs better than bolts? :-\

Title: Re: AAZ main bearing bolts
Post by: theman53 on January 14, 2014, 03:52:01 pm

Quote from: Mark(The Miser)UK on January 14, 2014, 08:08:52 am

Why are studs better than bolts? :-\

https://www.google.com/search?sourceid=navclient&aq=&oq=google+search+generator+&ie=UTF-8&rlz=1T4GGNI_enUS559US559&q=google+search+generator+fake&gs_l=hp..2.0l4.0.0.0.170743...........0.IZE1quQ8p8w&pbx=1#q=why+are+studs+better+than+bolts