when i got my blue '72 250ci mav it had a little bit of a miss. swapped in new plugs and it went away except a very slight miss around 50 and up in 3rd so since last night on the way home from the beach it started to get a little worse. figured the plugs were fouling again. im driving today and she just sputters to a stop and i roll into the speedy gas. i give 'er a min to cool down, go buy a drink and giver 'er a crank. it doesnt even sound like it was close to wanting to fire but a big thick cloud of white smoke comes out of the oil cap and through the dip stick. poped the timing chain was my first thought. so i pulled the dizzy cap and then spun the fan. the crank was turning as was the rotor so the chain is still in one piece since the dizzy is spun off the cam and i was turning the crank. tho the thought of a skipped tooth is still present. the inside of the cap looks very good as do the internals off the dizzy tho i dont claim to be the least bit knowlegable about points. but noting looked dirty or ate up or anything like that. eventually after letting it cool down for about an hour i limped it a few miles up the road to my girl friends house. it felt like it was on 3 cyls and didnt have anything to offer above 30mph im dealing with some very excessive crank case pressure and also smoking exhaust. but shes' missing so bad the tail pipe smoke could be from that but it looks more like oil then running rich at this point i havent even put a wrench to it yet. im going to pull the plugs first and see what they tell me. i'll post some pics too to get a 2nd opinion i look foward to hearing you guys thoughts
ditto the compression test.It may have had a burnt valve from the get go and now its just cooked/dropped broken off(hope its just burnt/stuck)Your crank case issue sounds like excessive blow by... a compression test will tell you what direction you need to go in.Good luck Tony
yea. compression check is my next move. probably wont have one untill tomorrow tho. guess i'll just ponder in the mean time...
you could pull the valve cover and see if any of the valves are missing/have broken springs or are stuck open...You could check the pushrods too to see if any are bent also.
If the rod and the cyl bore survived you could put a piston and a valve in it and get back on the road.I feel bad for you Tony(was hoping it didnt drop a valve)
its too dark to take a clear pic so i'll put it up tomorrow. anyway, i just finished taking the head off. on top of piston #3 theres a hole big enough to stick about 3 fingers into and the valve its self is down in the oil pan somewhere on a more postive note theres NO damage to the cylinder wall so i should just be able to pull the motor and slide in a new piston? the intake valve and combution chamber look a little scared but i think the heads OK. just needs 2 new valves put in.
Thats a plus!! Just hope the rod didnt get bent(I doubt it)At least you can yank that engine apart without removing it from the car.Drop the pan and go to town on it.I have seen heads/pistons with gouges in em work fine for years after the chaos that marked em.Holes though...well good luck man!!!
