Oil in exhaust

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gryan39
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Oil in exhaust

Post by gryan39 » Thu Mar 05, 2020 10:05 pm

No oil leak. Loosing oil from specks oil from exhaust. Also burning white/blue smoke on start up. Smoke Seems disappear once warmed up.
Been like this for few years tho seems bit more smoke recently.
Question is. What causes it. How sort it.
Or just live with it ?
Cheers

93fxdl
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Post by 93fxdl » Sat Mar 07, 2020 4:07 pm

There can be many causes of an engine burning oil.
Firstly, the oil itself,
Is it the correct viscosity, modern oils are very thin and can run through an older or worn engine.
Had it been changed lately, oil gets thinner as it wears, or lots of short journeys, which dilute the oil with moisture.
Secondly, wear in the engine.
Worn rings will allow oil past them and into the cylinder,
Tired valve guides and stem seals, also allow oil past them.
A blocked breather system can pressurize the crankcase and force oil past the rings and guides.
Are you certain it's oil out the exhaust and not just a mix of water and soot?
Ttfn Glenn

gryan39
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Post by gryan39 » Tue Mar 10, 2020 5:07 pm

cheers. no oil leaks so presumed its burning oil through exhaust. suppose just need get it looked at . thanks for reply tho

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Post by McRod » Thu Mar 12, 2020 11:34 am

Gerry,

What is making you think there are specs of oil in the exhaust?

Technically oil can`t come out of the exhaust system. The exhaust is simply the smoke from the explosion when the air, fuel and spark meet.

None of these sources can bring in oil from anywhere.

If the cyclinder head was leaking, you would have oil in your water bottle but the cooling/lubrication system on your engine is completely seperate from the combustion system.

Are you sure it isn`t soot mixed with condensation which would look like oil?.

gryan39
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Post by gryan39 » Mon Mar 16, 2020 9:18 pm

im thinking it prob is soot. i use oil and excess smoke on start up from exhaust made me think 2 +2 = 5.
the smoke goes once engine warm.
maybe just need a we overhaul soon ish

McRod
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Post by McRod » Thu Mar 19, 2020 9:28 am

Tbh mate i wouldn `t worry about it.

It`s an older engine and the rings etc will be a little worn etc. Thats where it`ll be using a little oil, but as long as it`s running well and not burning too much fuel it`ll be fine.

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