Outer Limits 4x4 Board

hey guys im going to be pulling my engine apart in the coming weeks as its blowing a light blue smoke and ive been told its with the piston rings ie. bottom rings that seperate the oil (so ive been told), how do i know if they are ok or not? the engine is a TD42 done about 270,000k's. it has new injectors, glow plugs, oils and filters.

could be gummy rings if the engine has had old shit oil runnin...

but compression test would let you know condition of the engine.

im not 100% sure but my mechanic reckons if you accelerate slightly after engine braking down a hill and theres blue smoke then it could be the rings? is this true/accurate cos i think ive been told mine smokes a bit of blue coming down cunninghams gap.

i can't remember what he said about the valves.. maybe if it smokes blue under normal conditions it could be valves?

shorty_f0rty wrote:im not 100% sure but my mechanic reckons if you accelerate slightly after engine braking down a hill and theres blue smoke then it could be the rings? is this true/accurate cos i think ive been told mine smokes a bit of blue coming down cunninghams gap.

i can't remember what he said about the valves.. maybe if it smokes blue under normal conditions it could be valves?

Other way around, smoke after coming down a hill is valve stem seals. In a petrol though, not a diesel.

Captain Datto wrote:

shorty_f0rty wrote:im not 100% sure but my mechanic reckons if you accelerate slightly after engine braking down a hill and theres blue smoke then it could be the rings? is this true/accurate cos i think ive been told mine smokes a bit of blue coming down cunninghams gap.

i can't remember what he said about the valves.. maybe if it smokes blue under normal conditions it could be valves?

Other way around, smoke after coming down a hill is valve stem seals. In a petrol though, not a diesel.

Before you start tearing apart a diesel at under 300k, what is its oil consumption like??
Sounds more like some basic servicing could save you alot of time and money.

You might be better off trying a CEM treatment, as its pretty common to see oil control rings glugged up and not working.
Clean them out, and your good to go again.

Search some of my posts about using diesel oil in pettys to clean then up and the rings, initially you may get more oil burn, but it settles down after a while as the rings clean up.

Trains

If it were mine, what I would do is a comp check, and cyld blow by test, to accertain what was leaking, ie valves, rings etc

That is if its using alot of oil.
If not, and it starts ok, runs smooth, valve clearances are all ok etc.
Then I would look at what cem or what ive done before many times with good results, is an oil change each week for a month to clean out the m otor, and let the oil do its job.

Trains

thanks trains might keep chainging the oil as its only using a little bit of oil, and start and runs fine. will keep you guys updated.

bospatrol wrote:thanks trains might keep chainging the oil as its only using a little bit of oil, and start and runs fine. will keep you guys updated.

Sounds like the engine is ok.

A comp test will confirm that.

Usually with diesels, poor starting, ie poor compression is the sign that low comps and money as the solution is the go.

just realised that you have the turbo.

I would be looking at that carefully too for a cause of your problems.

Anyway, an oil change each week for a month could not hurt it anyway.

T

At this stage, I would seriously advise you to look for other contributing factors before getting creative, and pulling the motor down.

Best not to leap frog over a problem.

Do a dry compression test followed by a wet compression test. If they differ then it's the rings.

A dry test is a normal compression test, to do a wet test, squirt a little oil down the cyclinder and run a another compression test. If the rings are worn, the oil will let them seal and return a higher compression reading.



All advice given in the understanding that a large amount of wild turkey had been drunken.