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post #1 of 15 (permalink) Old 04-01-2019, 01:42 PM Thread Starter
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Oil problem

I have a 76 t140 that's completely rebuilt. Almost immediately it started to puke oil out the exhaust spigots. Mostly on left. New pistons that are .20 over. I didn't put the rings on the guy that bored did. and I didn't check ring gap. Any idea what's going on? It's my first Triumph so I'm still green with British bikes. Thanks!
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post #2 of 15 (permalink) Old 04-01-2019, 04:14 PM
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You could have a look at the thread called burning oil. I have a similar problem, lots of help suggested there. So far Have the head and barrel off and nothing obvious !

Success consists of going from failure to failure without loss of enthusiasm. Anon
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post #3 of 15 (permalink) Old 04-01-2019, 06:06 PM
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With that much oil leaking,it needs looking at the valve guides and piston rings. I would bet on a broken ring.

Now,where did that bit fall off ?
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post #4 of 15 (permalink) Old 04-01-2019, 08:10 PM
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Hi Tracker,
If this happened on first start up, I think that I would check that there was not too much oil in the crankcases.
Drain the bottom of the engine, these are dry sump motors, so there should only be a little drop in there.

Did you check oil was returning to the oil tank in the frame when you first started the engine?

Regards
Peg.
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post #5 of 15 (permalink) Old 04-02-2019, 07:05 AM Thread Starter
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Hi Peg I don't think there is too much in the crankcase. But since it's my first Triumph I wouldn't know. it's returning to the frame fine. Maybe I'm not getting the dry sump idea. If I drain the crank case I can start it with just a lil oil in the crankcase? Do you have anything that explains the oiling system a lil better that the manuals
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post #6 of 15 (permalink) Old 04-02-2019, 08:37 AM
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I donít know where you are, but the bike can wet sump by just sitting there not being used. Therefore you should just drain the sump rather than guess since youíre having an oil related issue. Itís a very, very simple procedure. Why not eliminate it as a possibility ?
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post #7 of 15 (permalink) Old 04-02-2019, 09:40 AM
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Hi Tracker.
There is a crankcase Drain underneath the engine, towards the left side. It is important that this area is clean before you take it out and the drain is clean before you put it back, if you get grit inside the bottom of the engine there is a chance that you stop the return side of the oil pump working.
If you remove this crankcase drain, you should only get a small cup full of oil from the bottom of the engine.
You can run the engine once it has been drained and the cleaned (no grit) and the drain plug put back. The crankshaft is lubricated from the oil tank, so you are safe.

It is easier to think of the dry sump system system as two separate items, the feed and the return.

The oil pump is in fact two oil pumps inside one pump body.

Side one is the feed, oil from the tank is fed to the smaller of the two pistons and pressurised, it passes out of a non return ball valve to the chamber where the oil pressure relief valve sits. This valve is spring loaded, once 60psi pressure is reached it opens a port to dump the excess pressure, the excess oil from this port goes into the crankcase.
Once the oil pressure is regulated, the crankshaft and exhaust cam followers are fed with oil at 60psi, the used oil drops to the bottom of the crankcases.
The excess and used oil dumped in the crankcases has the bottom of engine flywheel spinning in it, this splashes up to lubricate the cylinder walls and inlet camshaft.

Side two is the return, a pipe in the bottom of the crankcases picks up the excess and used oil, through the larger of the two pistons in the oil pump, the return has 30% more capacity than the feed, so it will always clear out more oil than can be pumped in. This is a good thing, it means the crankcases do not fill up with oil.
Then retuns the oil to the top of the oil tank. Half way along the pipe is a tee, this feeds some oil to the valve gear at the top of the engine. Because the return side is pretty much open to the tank, the return oil pressure is low.

Regards
Peg.

Last edited by Rancidpegwoman; 04-02-2019 at 09:46 AM.
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post #8 of 15 (permalink) Old 04-02-2019, 09:54 AM
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Quote:
Originally Posted by rambo View Post
With that much oil leaking,it needs looking at the valve guides and piston rings. I would bet on a broken ring.
T'would be my bet too.
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post #9 of 15 (permalink) Old 04-03-2019, 07:13 AM Thread Starter
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last night I drained the crankcase and half a qt of oil came out. I wouldn't be surprised if I put it in there when I put the jug on. thinking on the Harley side of things(that's my daily 67 shovelhead) I thought that it was similar to it needing oil in the bottom end initially and then it would return to the tank. apparently not. where does the clutch and primary chain get oil from? what are the 3 little holes on the left case under the crank? are the returns or scavenge?


thanks everyone for the info so far! im learning quickly
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post #10 of 15 (permalink) Old 04-03-2019, 08:31 AM
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Hi Tracker
From you mentioning 1/2 quart came out, I suspect you are from USA.
If you mention your country in your profile (for USA Country and State), then it is useful, if you want recommend local dealers, etc.
Bike year and model are useful too, as there were lots of year on year changes.

There is a inspection cap in the top of the crankcase just above the primary chaincase, Initially pour 5/8 pint of the same oil as your engine oil.
The chaincase is topped up through the main crankshaft bearing, and the 3 little holes regulate the level. The oil is shared with the engine, that is why you must use the same oil in the main oil tank and the chaincase. (The gearbox uses different oil).

These might be useful to you:

http://www.classicbike.biz/Triumph/R...orkshop-Manual

https://partsbooks.britishonly.com/p.../20-10475C.pdf

https://partsbooks.britishonly.com/p.../20-10112C.pdf

You will need to work out which parts book matches your bike, the differences might be around the rear brake.

Best regards
Peg
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