I need some advise.

My engine overheated and coolant came in the chambers. The car wouldn't start anymore so we took the engine out thinking the head gasket (2mm Cometic) was blown.. it wasn't. But there was definately coolant in the oil.

We checked the short block. It's 0.2mm bent. Honda states a margin of 0.05mm.
Strange thing is that the cilinders themselves aren't bent at all, only the outer wall of the engine.
The head is bent too, but not alot.

Should I put it back in with a new HG or ....... rebuild the engine and fix the bent block. Last option is very expensive though.

Any experiences?

 

What exactly is bent? Do you mean the deck is not flat anymore?

 

Yes, the deck where the head gasket goes is not flat at all.
The head is bent too.

We decided to machine work the short block + header and reassemble it again.
Should be ok then.

 

the question is, how did it overheat?

 

Coolant wasn't filled correctly by the dealer. They didn't jack up the car and get all the air out of the system.
The car overheated and we tried to find the problem but found it too late.
Unbelievable they can't bleed correctly.

 

/\ lawyer time????

 

Check the head with a straight edge. I think by bent you mean that the head is warped. You can have this machined true again. If you mean the entire head itself has been compramised. If you are only off .002 on your deck that is not terrible and I have seen much more damage than that.. IMO what I would do is if you have to keep the head and block send it to a good machine shop. I know of a couple good places to send a engine to. We have some great vendors on here as well that would help. Since I see you are running a 2mm gasket maybe its time to do a complete short block. Personally If i knew a engine has been overheated I would worry about the head surface more than the deck of the block. Usually the deck can take more heat as I myself have had a F20C overheat. You should be able to take anywhere from .005 ,.010 off the head to make it true. How hot do you think you had the engine? Go back and check your surfaces in multiple places using a straight edge. Im sure with a little more help people should be able to give more advise. Let us know what we can do to help.

 

after you shave the deck and head - go with the 3mm inline pro head gasket - you will increase your compression by shaving them down.

 

You don't need to jack up the car to bleed the air out of the system.

 

Inline pro gasket is good. 3mm is around .118" . If you have to remove a total of .010" you will be around .171". That will equal 2.7432mm , so you would be running about a 2.75mm gasket. Should be just fine.