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Smoking engine under load - rings or valves?

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Britcheflee

08-25-2007 19:06:53




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I am going out tomorrow to get a brass fitting to check the compression on my 8N. However, I wonder if it is possible to determine what is more likely to be causing the smoking - valve seals or rings by the way it smokes? Mine starts just great and initially there is little or no smoke - then when I set off up the hill with the scraper blade which is pretty heavy - the smoke is thick - when I come down the hill the smoke receedes and at idle there is not a great deal of smoke - obviously under load it is producing far more smoke - is this because of the rings or the valve guide seal? I guess the compression test will help determine this but I want to order a kit to fix the smoke issue and would like to have this on hand when I take it apart again - but dont want to buy both kits if not necessary - and, just how hard is it to replace the valve guide/seals ?

lee

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Dave H

08-26-2007 05:28:22




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 Re: Smoking engine under load - rings or valves? in reply to Britcheflee, 08-25-2007 19:06:53  
Britch

with the minimal cost of adding the guides to the overhaul and probably exhaust valves if needed, why try to save a few bucks.

It only takes a few days to get the parts in anyway. What if you tear it down like mine and find that the oil pump is worn badly and needs a kit? What if you tear it down and find that some mechanic has shade treed a rod in and yu need to get a rebuilt rod to make it right.

We could what if it all day long. I believe in gettin in there and having a look first and doing some measuring.

Yep and what if your crank turns out to be 10 under like mine did?

I went for three rounds of ordering stuff for my 8N, think I have it now, but who knows. My goal is to get it cranked up by the time it gets too cold to work out there in the unheated pole barn.

course I may be all whet and you was the last one to have been inside there.

Have fun

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soundguy

08-25-2007 21:30:01




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 Re: Smoking engine under load - rings or valves? in reply to Britcheflee, 08-25-2007 19:06:53  
I'm also betting rings.

However.. a wet/dry compression test will pretty definitavely tell you if you have leaky rings or valvves.. etc.

wet numbers that come up are rings.. wet numbers that don't change any are valves..

soundguy



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Jerry/MT

08-25-2007 21:28:08




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 Re: Smoking engine under load - rings or valves? in reply to Britcheflee, 08-25-2007 19:06:53  
I'd bet on bad rings since it's a high power problem. Bad valve guides usually are a problem with high manifold vacuum which occurs at part thottle and idle. You said that you had little smoke when going down hill(usually a high vacuun condition) so I believe your rings are bad.



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Bob

08-25-2007 20:19:40




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 Re: Smoking engine under load - rings or valves? in reply to Britcheflee, 08-25-2007 19:06:53  
Since this is a "flathead" engine, it's TOUGH for oil to sneak past the valve stems, as it has to go UPHILL, and, furthermore, there's not much oil flying about the "valve boxes" on the side of the engine anyway, compared to the amount of oil that's continuously drizzling on the valvestems of an OHV engine.

Short answer... MOST likely the oil is sneaking past the piston rings.



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arthur ward

08-25-2007 21:11:36




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 Re: Smoking engine under load - rings or valves? in reply to Bob, 08-25-2007 20:19:40  
i agree. my 8n was rebuilt this spring. smoked worse than cheech and chong together at a party.
when they tore the engine down, the bearings were nearly perfect but the rings were almost non-existent. sounds like either a ring job or just use heavier oil. can't hurt a thing at this point.



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Britcheflee

08-25-2007 21:41:38




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 Re: Smoking engine under load - rings or valves? in reply to arthur ward, 08-25-2007 21:11:36  
I have 30wt in there at the moment...what do you think I should go up to?

Lee



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Ross Pugh(NC)

08-26-2007 09:52:59




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 Re: Smoking engine under load - rings or valves? in reply to Britcheflee, 08-25-2007 21:41:38  
If you have 30 wt now and smoking like that, I would go to 50 wt and try it.



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cargocult

08-26-2007 05:44:40




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 Re: Smoking engine under load - rings or valves? in reply to Britcheflee, 08-25-2007 21:41:38  
Try 40 wt



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