compression?
Thread Starter
|
Senior User
Joined: Jan 2006
Posts: 109
Likes: 0
compression?
if you do a compression test and all cylinders come within 10 % of each other does that absolutely rule out any cavitation problem? what should compression be on 91 7.3 approx. 200,000 or so? Have posted before was haveing prob w/ oil in coolant and every once in awhile would blow water back threw the overflow and out the top (not all the time) and would want to overheat. could start truck first thing and drive bout 15 mins and water would come out over flow, fill rad back up and could drive all day and never do it again only at first start up of the day. Have replaced both head gaskets now but still wants to run a little warm have taken out thermost and seems to have stopped prob. just want any input u can give and before i go any further just want to rule out any cavitation prob. thanks again
Posting Guru
Joined: Sep 2002
Posts: 1,897
Likes: 0
From: Northeastern Pa - USA
oil in the coolant is usually a problem with the oil cooler. If you are pushing coolant out the overflow without any signs of oil in the radiator, you problem have a head gasket problem or cracked head.
if the coolant is leaking into the crankcase, it will usually show up as white gummy crap on the oil fill cap or in the valve covers. (drivers side comes off easiest)
if the coolant is leaking into the crankcase, it will usually show up as white gummy crap on the oil fill cap or in the valve covers. (drivers side comes off easiest)
Postmaster
Joined: Dec 2002
Posts: 3,594
Likes: 2
From: Southern Oregon USA
Put a new thermostat in. From the symptoms you give, it should take care of your problem. Since it seems to only push water out after a short time and then is fine the rest of the day, I don't suspect any cavitation or cylinder problem. I agree with bilder12 that the oil is coming from the cooler.
It is not a good idea to run without a t stat. Removing the t stat doesn't give the coolant enough time to remove the heat from the engine like it is supposed to. The gauge will read cooler, but the engine will actually run hotter.
Jason
It is not a good idea to run without a t stat. Removing the t stat doesn't give the coolant enough time to remove the heat from the engine like it is supposed to. The gauge will read cooler, but the engine will actually run hotter.
Jason
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
Only use a thermostat from International or Ford. The others will cause problems.
It should have a rubber gasket around the outside surface if it is the correct one.
Also check the bypass ball valve in the thermostat housing for gasket material that is blocking it from moving freely.
It should have a rubber gasket around the outside surface if it is the correct one.
Also check the bypass ball valve in the thermostat housing for gasket material that is blocking it from moving freely.
