cracks in compression chamber

[Teonanacatl]

Hi Guys I need some help.
Some mates drove my car up to where I live for me (Cape York Australia) and overheated it and blew a head gasket. Upon taking the head off I see the compression chambers on the bottom of the head have some serious cracks in them. Do the cracks matter or do they not matter, seems everyone I ask has a different opinion. I will replace them if it matters.
Thanks
Lachlan

 

[Radd Cruisers]

Yes, the cracks matter...

Which engine are you running?

You have not given much in the way or details: year, model, engine, etc.


~John

 

[Teonanacatl]

Sorry mate its a bj70 1985 with a 3b engine. According to the factory service manual replacing the compression chambers is fairly simple so I guess Ill have a go. Would these cracks contribute to the loss of compression Ive got?
Thanks for your help.

 

[Radd Cruisers]

It's not hard to do, though you might need to surface the head after they go in depending on the protrusion.

Give Neil at Roodogs 4WD Spares in Melbourne a call and he'll get you set up with the right parts.

The cracks do not affect compression, but if the pre-cups break up and fall into the engine, it's disastrous.


~John