cracked pre cups?

[ghitch75]

i'm changing head gaskets on my burb and found 3 of the 4 pre cups are cracked on the passenger side head.......do they need changed?.....where to get them and are they hard to change out?

 

[WarWagon]

How long are the cracks? Yes there is a service limit on cracks and some are acceptable per the GM service book. Not that many would put a cracked part back in for any reason...

The precups just push or tap out with a wooden dowel through the injector hole in the head. They must match what is in the other head. Be careful of the knock off precups that are magnetic.

 

[ghitch75]

How long are the cracks? Yes there is a service limit on cracks and some are acceptable per the GM service book. Not that many would put a cracked part back in for any reason...

The precups just push or tap out with a wooden dowel through the injector hole in the head. They must match what is in the other head. Be careful of the knock off precups that are magnetic.

they maybe 1/8" to 3/16"......i'm pulling the other head to so i would just replace them too.....are they aluminium?.....where is the best place to get them?

 

[ak diesel driver]

They are inconel. There are some on eBay. Just be careful to get the good ones.

Sent from my Studio 5.0s using Tapatalk

 

[ghitch75]

They are inconel. There are some on eBay. Just be careful to get the good ones.

Sent from my Studio 5.0s using Tapatalk

stupid question?....which are the good ones??

 

[ghitch75]

anyone used these?

http://dewarsengines.com.au/products-page/new-parts/6-5-diamond-pre-cups-turbo/

 

[WarWagon]

anyone used these?

http://dewarsengines.com.au/products-page/new-parts/6-5-diamond-pre-cups-turbo/

Those looks like bad ones. :sick: 'Need additional work' is expensive and hard to find a machinist that will mess with them.

"will nead to be machines by a competent machine shop"

Try http://www.peninsulardiesel.com for parts.