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HG Burning oil
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BAD

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Mike B

06-28-2002 09:22:01




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The HG we hauled home smoked really bad and after an hour fouled out the plugs which actually had oil dripping off them. We tried a quick fix with a new set of rings because the cylinders seemed to be in good shape but that has not improved things much or in fact even made it worse. Any ideas? How much oil can actually get up the valve stems. Does this motor use valve stem seals? How much oil is this thing supposed to hold. Could the oil level be to high? Help!

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MIKE B

07-01-2002 04:49:44




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 Re: HG Burning oil - BAD in reply to Mike B, 06-28-2002 09:22:01  
Thanks for all the ideas. We had a good ring end gap clearance like .002 but never honed the walls. The valves and guides are really sloppy so they must be worn. There is a lot of oil flying around the lifters and springs. I Guess its time to take out the engine and the check book. So much for the QUICK FIX!



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RAB

07-01-2002 11:30:30




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 Re: Re: HG Burning oil - BAD in reply to MIKE B, 07-01-2002 04:49:44  
You would see clearly if its going in through the inlet - the valves will be covered in oil and probably carboned up on the back of the head and around the stem. Also, there should be plenty of oil around the spring and lifter area. Have you got severe crankcase pressure? - remove the filler or dipstick and look for lots of gas escaping while running. You could try doing a compression test to see how things are in the cylinders. The ring gap should be more than 2 thou.
The sloppy valve guides will inevitably allow the valve seats to wear.
Have you tried running without the filler cap on? - provided oil does not spew out! If it is gassy and stops burning blue from the exhaust, then the problem will be overcome by finding and rectifying the cause. I still favour oil-pumping due to too much side clearance on the top rings, glazed bores or a blocked crankcase breather.
Regards,RAB

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Crawler boy

06-29-2002 14:23:52




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 Re: HG Burning oil - BAD in reply to Mike B, 06-28-2002 09:22:01  
1.Have you checked if the cyl. are overbore ??
before installing new rings,if it�s overbore and
you install STD rings you�ll get the wrong clerances and if the cyl is worn out the compression will go down in the crankcase and build up pressure
and press oil past the rings up in the cyl
check the cyl bore size

2.If the cyl are oval (engine has run a lots of hour )it takes some time for the rings to get set in the cyl

3.installd the rings correctly,compression rings# 1,2 oil ring 3

keep oil level to the mark on the stick crankcase capacities:5 1/2 gallons

About the valveguide seals i dont think they have any the valves are uppsidedown in the block (side valve engine)

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Gary

06-29-2002 17:15:51




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 Re: Re: HG Burning oil - BAD in reply to Crawler boy, 06-29-2002 14:23:52  
If you put 5 and a half gallon of oil in the crankcase you had better put a big tub under it to carch it



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Crawler boy

06-30-2002 07:33:26




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 Re: Re: Re: HG Burning oil - BAD in reply to Gary, 06-29-2002 17:15:51  
Sorry i red on wrong line in my instruction manual
it sould be 5 1/2 quarts oil in crankcase



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RAB

06-29-2002 06:34:25




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 Re: HG Burning oil - BAD in reply to Mike B, 06-28-2002 09:22:01  
Did you try a new ring in the bore, top and bottom, by pushing it down square with a piston? This may reveal the amount of bore wear by comparing the different diameters, calculated from the difference in ring end gap, in the wearing area and non wearing parts of the bores. This will give an idea of the wear, as would checking for a ridge in the bore above the top ring. The problem also could be oval or glazed bores, rings installed incorrectly, too wide ring grooves on the pistons, too much sump oil, inlet valve guides (particularly if it is an over-head valve engine), blocked engine breather, bent con-rods..... ..
Hope its simple like the breather, regards, RAB

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Geoffrey

06-28-2002 15:02:54




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 Re: HG Burning oil - BAD in reply to Mike B, 06-28-2002 09:22:01  
You might try replacing the valve guides. I don't know about the stem seals. Also, did you hone the cylinders when you had it apart? You should of when you put in new rings so they could seat properly. If those two don't help then I'm not sure right away.



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mike b

07-01-2002 04:40:35




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 Re: Re: HG Burning oil - BAD in reply to Geoffrey, 06-28-2002 15:02:54  
Thanks for all the input. Sounds like we should take it apart and do some serious investigating. Our new rings had about .002 end gap 1/2 way down the bore. We did not check for oval bores or hone the walls. The valves are also pretty loose in the guides. So much for the QUICK FIX right!



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