blow by?
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From: Florence
blow by?
So I'm getting ready to pull my engine to redo my timing cover.. my engine has over 320000 miles on it and it runs strong, dyno'd 402 hp at the wheels recently.. I was considering dropping a reman in since im pulling the engine anyway... I heard you can test for blow by buy sitting your oil cap over the spout and seeing if the cap blows off.. well the engine tilts downward in the back so the cap just slides off but in the dark when i shine a flashlight you can see the fumes just billowing out... how do i know if this is too much... what else can i do EASILY to see if my engine has issues before i start taring it down?
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From: Asheville-where weird is
If you have to wait until it is dark, use a flashlight, and the cap just slides off...I would say you are most likely OK.
I looked at an F450 with a flat bed recently...price was right until I checked for blow by. In broad daylight you could see it puffing. Cap did not have a chance to slide off...it was blown off. Pulled the intake boot and looked at the wheel and saw large dings with chunks missing.
I looked at an F450 with a flat bed recently...price was right until I checked for blow by. In broad daylight you could see it puffing. Cap did not have a chance to slide off...it was blown off. Pulled the intake boot and looked at the wheel and saw large dings with chunks missing.
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From: Texas
As mentioned, compression test is the definitive answer. For the oil cap test, ignore the smoke. It's not about smoke it's about pressure.
Blowby will shoot the oil cap up into the air a little (or a lot) instead of just letting it slide off. If it's sliding off too quick, lay a rag over the oil fill tube and see if it bubbles up from the pressure.
Again, smoke means nothing. My truck will smoke a little or a lot depending on oil type, miles on oil, temperature, etc. It's been that way for several hundred thousand miles.
Blowby will shoot the oil cap up into the air a little (or a lot) instead of just letting it slide off. If it's sliding off too quick, lay a rag over the oil fill tube and see if it bubbles up from the pressure.
Again, smoke means nothing. My truck will smoke a little or a lot depending on oil type, miles on oil, temperature, etc. It's been that way for several hundred thousand miles.
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From: Florence
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From: Asheville-where weird is
Someone else may differ....
As snakedoc and F350-6 said, a compression test is the only true way.
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absolutely. but with a blowby test, oil dipstick, etc, plus a cold start no glowplug test, you could get an idea without having to pull valve covers and purchase tools.
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From: Asheville-where weird is
There is no better time than now to do a compression test in order to decide whether to spend $5-7K or not.
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From: Florence
What compression test would be best to perform procedure wise? There are a few different types that show different information and I've not actually done any myself before but they don't look complicated... Which will give me the information I need to evaluate my engine?
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