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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

3306 cat

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07-08-2004 12:06:22

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I rebuilt a 3306 for my boss to sell. After it was bought it was put in a wood chipper.(sold to a customer acouple hundred miles away) Anyways the customer says that it runs great, good power and very little blow by. The problem is that it is blowing oil out the exhaust. About 4 quarts every 2 hours he says. I was wondering if maybe the rings are not seating? or if anyone has any other ideas? He had took off the turbo and exhaust manifold off and ran it and it was still blowing oil out exhaust. The head was completly redone but could the oil be coming past the valves? any suggestions would be appriciated.

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07-09-2004 21:20:48

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 Re: 3306 cat in reply to Joe, 07-08-2004 12:06:22  
Could be head I drove a freightliner with a 3306 in it always had the head off one of them . they were good little motors if you could keep them going

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Len Sholes

07-08-2004 22:13:16

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 Re: 3306 cat in reply to Joe, 07-08-2004 12:06:22  
Joe,it could be a case where there isn't enough load on the engine to make it work and the rings didn't seat. This been the case you will have to re and re the pistons and run a ball hone in the liners to get a cross hatch pattern, replace the rings and reassemble then when you start it up make sure your cutomer has enough product on hand that can be put through the chipper to make the engine work in order that the rings will seat. Most chippers I have seen spend a lot of time not really working as branches go through so fast the engine never works.

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07-08-2004 13:04:08

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 Re: 3306 cat in reply to Joe, 07-08-2004 12:06:22  
Joe, Ask what cyl is blowing the most. It could be coming down the valve guides but at the rate you say There must be a serious problem with one or all cyl,s. You should really go there to see it while it still can be run to get an idea what's wrong. You may have got the wrong rings for the pistons you have too. Another thing, make sure the turbo oil return line is clear or oil will blow out the cartridge seals and through the engine and out the exh. Later Bob

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07-08-2004 18:47:44

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 Re: Re: 3306 cat in reply to Bob/Ont, 07-08-2004 13:04:08  
One other thing Joe, check the oil in the pan for sand or anything else someone may have put in there to ruin it.
Later Bob

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