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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Tecumseh OH160 -Case 1816

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A.J.

06-18-2004 08:36:50




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I bought this case loader from a mechanic & friend who told me the engine is fairly new. Trouble is the breather from the valve cover is pressured up and spitting out some oil. The engine manual says "blow by" the rings etc. I did a compression check and there is 155 psi with throttle open and engine warm. I tried reversing the breather orientation and only got worse. I took the valve cover right off and started and idled the unit....big mistake got lots of oil splashing up there. There seems to be a knock from the engine but this could be normal ....I've never heard one running before. Any thoughts from you folks?
aj

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Max

06-18-2004 18:36:32




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 Re: Tecumseh OH160 -Case 1816 in reply to A.J., 06-18-2004 08:36:50  
Its been awhile, but I think there was an oring on the oil fill cap that would go bad, check the seals on the push rod tubes, and any other seal for signs of oil leaks. These units were designed to run a slight vacuum in the crankcase and if there is any leaks it will pressurize causing problems. Also the trough opening on the breather should be facing away from the carb. Hope this helps.



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AJ

06-18-2004 21:29:34




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 Re: Re: Tecumseh OH160 -Case 1816 in reply to Max, 06-18-2004 18:36:32  
Max- Thanks for the reply! I checked the O ring as you mentioned...looks good...hard to say about the push rod tubes without taking the covers off...though I will do that soon....Just one thing I thought I'd mention: When I put my finger over the breather tube I can feel the pressure pulsations of the piston stroking...do you think this is normal? Your thoughts? AJ



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Max

06-19-2004 07:30:50




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 Re: Re: Re: Tecumseh OH160 -Case 1816 in reply to AJ, 06-18-2004 21:29:34  
With the size of that piston, there will be some pulsation. Like another post said, these engines do take a beating and when you consider they were designed to run at 2850 rpm and Case ran them at 3750, so you can see the importance of changing the oil frequently. There were some Case technicians that claimed toget a 1000 hours on these engines when the average was around 400. The high hours were attributed to frequent oil changes like at twenty hours or every 8 hours of use. This is by no means to be taken as bad mouthing Case or the Tecumseh engine, the engine was just being worked at on the high side of its design. Most of the problems I seen with these units in the late seventies and early eighties were bad seals, which if caught soon enough would avoid broken parts. Hopefully this was caught soon enough, otherwise you may be looking at the worst senerio.

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Grumpy

06-19-2004 05:23:21




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 Re: Re: Re: Tecumseh OH160 -Case 1816 in reply to AJ, 06-18-2004 21:29:34  
Oil blowing out breather tube is a broken piston . A ring land will brake allowing combustion pressure into crankcase. These engines do not stand hard lugging. You have to keep rpm up. Stan



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AJ

06-19-2004 14:06:52




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 Re: Re: Re: Re: Tecumseh OH160 -Case 1816 in reply to Grumpy, 06-19-2004 05:23:21  
Thanks for you thoughts guys ! I guess what has me scratching my head is if there is blow by ...then how can I get over 150 PSI out of a couple of cranks? I guess anything is possible as I've seen strange things before. On the point of lubrication ...how is the engine going to be damaged if the sump splashes oil around all the time and the oil..granted in excess is making it's way to the top at the valves. Either way I'm interested in pulling the cylinder off...I guess on that point the diagram in the book seems to show that you can take the cylinder off without splitting the block.....is this true...???? Thanks again guys! AJ

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