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Showing results for tags 'cylinder head failure'.
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I am in need of a bit of advice from anyone with experience in the area of engine rebuilding. I've done lots of rebuilds in my time, about 20, of which only 5 involved/required professional machining, and never once ran into so many problems. Short version, i had coolant leaking in to oil, pulled the head, couldn't see any obvious leaks, but suspected the fact that because the head was quite warped (~0.5mm) that it was just simply a head gasket failure. The head has serious problems, but i cannot source a new one, so I'm doing a bit of a dodgy patch up just to get the car into a position where it can be run. While i have the head off, i thought now would be a good time to change the big-end bearings, as there has always been a bit of a knock or slap when hot. When i got the bearings out, i found they were 0.25 under size, so this crankshaft has previously been ground. the crankshaft pin journals looks mint, and to be honest, so did the old bearings, but i had the new ones and thought, what could possibly go wrong, plus i am hoping that the new ones would quieten the noise by increasing oil pressure which is notably low. There is no such thing here as plastigauge, or assembly lube, so I'm roughing it. I am relying on the fact that i just removed 0.25 mm bearings, and am replacing them with identical new ones. I torqued them up with everything covered in 20-50 oil, but its just completely locked up. I have never experienced this before. So i undid them all a bit and found that if i have them tight at all, as in, as tight as my hand around the head of the ratchet handle, with minimal hand torque, its completely locked up and if i loosen them, it turns, so it is definitely the conrod bearings causing an issue. After this, i checked the bearings, and number 1 seems to have a bit of scoring already. nto terribly bad, but bad enough for me to scream so loud that the village thought the car fell on me. Now given that it has just had a head gasket failure, and water went through it all, i suspect it simply needs some gentle encouragement, in the form of some oil pressure. So i attempted to put as little back on the engine to build up oil pressure, but then realise during that attempt that jsut cranking isn't going to give me sweet fek all.. So my predicament, If i tighten the bolts, enough to safely run the engine, the engine wont crank. If i loosen the bolts enough to crank it, i don't want to start it because I'm worried something will rattle loose.. (anyone ever done this?) i can't just crank it because the pump needs to be running fast to overcome the gravity to prime the system. Is there any dodgy yet miraculous resolution anyone can think of, short of scrapping the whole thing? I have been thoroughly clean. I'm under the car doing this with a spray can of degreaser in hand, cleaning everything, before smothering it in oil. Dirt is not the issue.
