Compression Test Results
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Compression Test Results
Compression Test Results
I just completed a compression test on my 1997 F250HD 351 and my results are as follows:
1=145, 2=150, 3=145, 4=145, 5=120, 6=150, 7=150, 8=145
I have white smoke and steam coming from the tail pipes that’s why I did the compression test. What is the diagnosis? Before this problem I had a bad FPR and it was allowing fuel into the #8 cylinder and causing the motor to Hydro lock.
I just completed a compression test on my 1997 F250HD 351 and my results are as follows:
1=145, 2=150, 3=145, 4=145, 5=120, 6=150, 7=150, 8=145
I have white smoke and steam coming from the tail pipes that’s why I did the compression test. What is the diagnosis? Before this problem I had a bad FPR and it was allowing fuel into the #8 cylinder and causing the motor to Hydro lock.
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I did have coolant in the radiator. It is now gone, not all gone just low. I ran the truck for a bit to warm it up before the pressure tast and did not see any wite smoke / water in the tail pipes. I did in the past smell what you were talking about.
Cargo Master
Joined: May 2007
Posts: 2,071
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From: British Columbia
I worked on an Escort this summer that had this intermittent white smoke problem. Most of the time it was fine, every once in a while huge clouds of white smoke poured out behind the car.
It turned out the (aluminum) head was cracked between the valves in two cylinders. Often the cracks would be clogged with the usual coolant sediment, but when the engine got hot or when there was a lunar eclipse, the crack(s) started to open and allow coolant into the chamber and whoo boy, smoke screen.
I had to change the head, but with cast iron heads usually the heads don't crack, the gasket just fails.
It turned out the (aluminum) head was cracked between the valves in two cylinders. Often the cracks would be clogged with the usual coolant sediment, but when the engine got hot or when there was a lunar eclipse, the crack(s) started to open and allow coolant into the chamber and whoo boy, smoke screen.
I had to change the head, but with cast iron heads usually the heads don't crack, the gasket just fails.
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Freshman User
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I worked on an Escort this summer that had this intermittent white smoke problem. Most of the time it was fine, every once in a while huge clouds of white smoke poured out behind the car.
It turned out the (aluminum) head was cracked between the valves in two cylinders. Often the cracks would be clogged with the usual coolant sediment, but when the engine got hot or when there was a lunar eclipse, the crack(s) started to open and allow coolant into the chamber and whoo boy, smoke screen.
I had to change the head, but with cast iron heads usually the heads don't crack, the gasket just fails.
It turned out the (aluminum) head was cracked between the valves in two cylinders. Often the cracks would be clogged with the usual coolant sediment, but when the engine got hot or when there was a lunar eclipse, the crack(s) started to open and allow coolant into the chamber and whoo boy, smoke screen.
I had to change the head, but with cast iron heads usually the heads don't crack, the gasket just fails.
Yep... I think if I filled the coolant back up the smoke would start again. Yes tons of white smoke so much it looked foggy outside.
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Cargo Master
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From: MI..."near" Dearborn...
Oh boy...
...bummer...stop runnin' it man...it will only get worse...take the head to a
"good" cylinder head shop...IF it ain't too poo-poo'd...they "should" be
able to bake-it straight...weld-it-up...check it out...and...
... you'r good-to-GO-man-GO...
Been there done that...I had one with 4 cracks once that I had
repaired 'cause at that time I did not have the scratch for a new
one and it lasted years...
"good" cylinder head shop...IF it ain't too poo-poo'd...they "should" be
able to bake-it straight...weld-it-up...check it out...and...
... you'r good-to-GO-man-GO...
Been there done that...I had one with 4 cracks once that I had
repaired 'cause at that time I did not have the scratch for a new
one and it lasted years...
Lead Driver
Joined: Aug 2003
Posts: 6,305
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From: Boulder Creek, Ca
Not an authority, certainly would not drive until problem is solved. Seems compression on all cylinders are within spec's, and did not find any coolant, or water in oil. It's rare but wonder if it's possible the fuel pump diaphram could be leaking. Anyhow, just a thought. 
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Freshman User
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Not an authority, certainly would not drive until problem is solved. Seems compression on all cylinders are within spec's, and did not find any coolant, or water in oil. It's rare but wonder if it's possible the fuel pump diaphram could be leaking. Anyhow, just a thought.
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