06-20-2011 10:22 AM
In general it could be several things. Cracked piston, broken rings, scored liner, turbo. Generally it is getting compression in to the crank case. It can be measured, that is the best way to determine how bad it is.
08-17-2011 01:04 PM
Hi Cat Tech.....
Last week i did blowby test on 336D hyd excavator, machine series no PRF......In this cases i'm using caterpillar multitech tools to identified blow by gas come out from the c9 engine. After completely attach the tools, run the engine and take the reading during engine running low idle. The results was ok and within spec, but the heavy blowby gases still occurs.
My questions is
1. Can we take the reading during engine high idle?
2. Which unit we have to take, Cu ft/hr or L/hr
3. Why c9 engine breather attach at engine block not as usually caterpillar engine, the breather located at rocker arms cover?
4.Can u brief me shortly, why ratio is important during perform heavy blow by test.
Lack of knowledge....
08-31-2011 05:03 PM
I usually check them at low idle, high idle, and at stall, that will give you a good indicator of the engine condition. It really does not matter what you measure it in as long as it is a cubic measurement. THe general rule I use is if it is more than twice the rate HP it is bad. EX. a 300 HP engine has the blow by at stall of 650 cu ft/hr, that would be bad.
Sorry for the delay, I do not get on here much.