CAT 3304 Totally Frustrated!!!!!!!!

ddk114

Member
Cat 941 B Serial 80H04086, 2P6776 engine arrangement, engine serial 78P1842. Had a major overhaul 1300 hours ago with major block work. #2 cylinder is dead. Upon disassembly found #2 had a severely bent exhaust pushrod, oil/fuel in coolant system, crack in head on #3 from injector to valve. Head gasket appears not to be blown out or deformed. ONE GASKET--NO SPACER PLATE. Everything looks good on bottom end.
My parts book has head part # 2P6274. I don't have access to see if this number was superseded to another number. The head I pulled from the Cleveland Bros. overhaul has a casting # 2W654. My research found one listed for a 3304 as 8N1188 PC/SP for casting # 2W654. I am assuming that this means pre-chambers and spacer plate. BUT I DON'T HAVE A SPACER PLATE!!!
My question is what is the correct part # ??? Can a spacer plate head be used on a non-spacer plate engine?? How did the oil get into the cooling system??? What effect does a bent exhaust pushrod have on the flow of fuel/air through that cylinder??? I tend to think that the air would be trapped with additional fuel being added with each cycle. That fuel has to go somewhere. It did make a lot of white/blue smoke.
I thank you for replying in advance. I sometimes get a little baffled trying to figure stuff out. I thought this was a good one for you experts. Will be purchasing a NEW head as soon as we get this figured out. Thanks again.
 
I don't believe a spacer plate head can be used on a non-spacer plate block.....but then again I've never tried it either.

That said, with all the info you have, call your local CAT dealer and ask their parts guys. They will be able to tell you what the newest part number is. Some may be resistant to offer up 'free advice/part numbers' so ask them to email you a quote on the part. The quote doesn't mean you have to buy it, but it should have everything you need to find a new one on it.

With that in hand, call Offroad Equipment Parts, and give them the part number. They should be able to get you a loaded CAT head that you can set right on and bolt down.

As for the bent push rod, it depends on how bent it is. If it's still in place, and working, the valve will still open and close, just not as far as it should. As for the exchange of fluids between systems, that happens through cracks in the head, unsealed area of the head gasket caused by the head damage, etc, etc. Oil will get pushed into the water under pressure, and the water will gravity flow into the oil when the engine is off and there is no oil pressure.

Good luck, and if you need any more help, holler at me and I'll be happy to do what I can to help.
 
There is a thing called a Master Reman Technical Supplement. I spent a little time looking through it online to find what I needed. It keeps track of changing part numbers and exactly what goes with what. You can take those numbers and wash them through the online cat store for verification. The new part number for 2P6274 is 8N1188. I verified that number by requesting a quote for a head based solely on the serial number of the machine. It came back with the same number. The 2W654 casting number was found in the supplement as 2W0654. I washed that through the store, and guess what I found? >>> 8N1188. I'm tired now, I think I deserve some sleep! Thanks everyone.
 
Take the pushrod and roll it on a pane of glass. If you see a wobble don't use it. A rod that isn't straight is much, much weaker than a straight one. It will probably bend again if you use it.
 

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