Hope this helps= HTH
Catastrophic overheat
- Thread starter lambrose
- Start date
- Status
Originally Posted By: cos
Sounds like a very good plan.
What caused the overheat?
The upper radiator hose popped of the thermostat housing.
Sounds like a very good plan.
What caused the overheat?
The upper radiator hose popped of the thermostat housing.
I've had a serious overheat coming off US Interstate 290 after blowing a water pump seal on a Chrysler 225 cu in slant six. Boiled out everything except the bottom of the block. Pulled over 2 miles from home. Wife picked me up and I went back after supper, restarted and drove home. After replacing water pump, I did your exact MMO plan and wound up keeping the car for 14 years of commuting: another 8 years! The valve guides on number 5 and 6 were worn and using some oil at 214,000 but that is not unusual for an in-line 6. Got my money's worth.
Happened again with a heater hose on a Chevy 305 V8. Same drill with getting it home, replaced the hose and then MMO/Oil for an abbreviated OCI (3,000 instead of usual 5,000). Kept that car for 10 years: another 5 after the overheat. It was a Caprice...kinda big for commuting and I had an retired father giving up his mint low miles Dodge Dynasty LX with a Mitsu 3.0L V6 (a very nice car), otherwise I would have kept the Caprice.
In both cases, the engines were close to seizing before repairing the cooling system and doing the MMO/Oil OCI. They ran normally with no loss of power or gas mileage after about a week of driving.
I was lucky...I could see the steam because it was fair weather. You may need to go up one grade of oil if there is a little scoring causing some blow-by, but from 5w30 to 10W-40 is no big deal. A bottle of blue STP Oil treatment will do that if it is needed after the oil is put in. Bet you were real happy that you kept the oil topped off...always a good thing. Good Luck!
Happened again with a heater hose on a Chevy 305 V8. Same drill with getting it home, replaced the hose and then MMO/Oil for an abbreviated OCI (3,000 instead of usual 5,000). Kept that car for 10 years: another 5 after the overheat. It was a Caprice...kinda big for commuting and I had an retired father giving up his mint low miles Dodge Dynasty LX with a Mitsu 3.0L V6 (a very nice car), otherwise I would have kept the Caprice.
In both cases, the engines were close to seizing before repairing the cooling system and doing the MMO/Oil OCI. They ran normally with no loss of power or gas mileage after about a week of driving.
I was lucky...I could see the steam because it was fair weather. You may need to go up one grade of oil if there is a little scoring causing some blow-by, but from 5w30 to 10W-40 is no big deal. A bottle of blue STP Oil treatment will do that if it is needed after the oil is put in. Bet you were real happy that you kept the oil topped off...always a good thing. Good Luck!
Originally Posted By: demarpaint
I've never tried Power Foam but it might work for you. I would consider a MMO piston soak. The trick is to be patient and take your time. Fill the cylinders, let it soak over night, then turn the damper pully and refill the cylinders again. Do this over a period of a few days, then crank the engine with the starter with the plugs removed. Replace the plugs and start the engine. Run a full OCI with 1 qt of MMO for the next 2 OCI's. I think you'll be OK.
I think that is a good plan.
I've never tried Power Foam but it might work for you. I would consider a MMO piston soak. The trick is to be patient and take your time. Fill the cylinders, let it soak over night, then turn the damper pully and refill the cylinders again. Do this over a period of a few days, then crank the engine with the starter with the plugs removed. Replace the plugs and start the engine. Run a full OCI with 1 qt of MMO for the next 2 OCI's. I think you'll be OK.
I think that is a good plan.
Well the MMO (1qt) went in the crankcase and (8 oz) in the fuel tank today. Not much to report as of yet. The engine runs great but the truck is in the shop for some transmission work, so I will have to wait until next week at the earliest to see if there are any drivability improvements. I will do my best to keep everyone informed and hopefully my results will be of some future benefit to somebody experiencing a similar issue.
- Status
Similar threads
