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Replying to Thread:

oil in exhaust 4-53


Created On Thursday 20, May, 2004 10:18 PM by roper99

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Diesel Talk Forum

roper99
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Posts: 2
Joined: May 2004

Note Thursday May 20, 2004 22:18 View thread in raw text format
Diesel Talk
I recently purchased a 4-53 to use as a pump motor. The motor runs great and when I bought it it had no signs of it's current problem. After running for about 5 minutes at higher rpm (15-2000) it begins spraying oil out the exhaust, not like it has been burned in combustion but like it is leaking into the exhaust manifold from somewhere. I pulled the manifold off but could see no clear sign of where it might be comming from except maybe the valves. Would leaking valve stems cause this? I am running 30 wt oil, but maybe not the highest quality. The motor was previously used to power a pump, came with the pto clutch already attached. It had sat for a couple of years before I bought it, not sure if the previous owner put it to bed properly but I followed the users manual before running it. Help please
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badges65
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Posts: 132
Joined: Jul 2002

Note Friday May 21, 2004 01:15 View thread in raw text format
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HI,
is it smoking whilst running and if so what colour???
don

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http://invertedvboats.741.com/
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roper99
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Posts: 2
Joined: May 2004

Note Sunday May 23, 2004 12:36 View thread in raw text format
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Hi Don, No, no smoke in the exhaust, either at idle or at higher rpm. Just leaks oil out through a small exhaust leak where the manifold and muffler bolt together and the exhaust pipe end has oil running down it. This would not be such a problem if the oil didn't get blown all over by the cooling fan. It leaks about a quart every 8 hours of run time. Thanks, Stewart
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badges65
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Posts: 132
Joined: Jul 2002

Note Monday May 24, 2004 01:09 View thread in raw text format
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HI Stewart,
i would be looking for an oil leak above the area that is either running down or dripping onto the manifold tappet cover gasket would be the first place to check wash down and then run and check for leaks!!!!!!
don

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http://invertedvboats.741.com/
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ROALDERIC
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Posts: 11
Joined: May 2004

Note Friday May 28, 2004 10:23 View thread in raw text format
Diesel Talk
First, you are using the wrong oil. You must use a straight weight 40 weight oil specifically designed for a two stroke oil. It needs to have an ash content under 1.0 - usually .85 which is recomended by Detroit Diesel. Second, you may be experiencing what is called "wet stacking". The 53 series engines are particularly susceptible to this when they are not fully loaded. You will need to check your exhaust temperature when the engine is fully loaded. If it is below 500 degrees, you will continue to wet stack and ultimately glaze the cylinders. You can verify this with an infrared heat gun. If your temp is low, install a restrictor in the exhaust with a 1 1/2" hole in it and run it full
throttle until the exhaust temp comes up as close to 900 degrees as possible. It should dry up the exhaust in about an hour. When you pull the manifold after this, it should be black and powdery, with very little oil. If the oil consumption persists after this, check your blower seals. I will watch for your post and tell you how to do that if the restrictor does not work.
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