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web site for detroit diesel owners

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bcPA

05-27-2005 00:29:53




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I am looking for a web site to help me repair a detroit diesel and diagnose its problem. a site similar to ytmag or red power is what I want. It happens to be a 471 that is leaking anti freeze out a breather. Thanks.




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THaden

05-27-2005 04:10:04




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 Re: web site for detroit diesel owners in reply to bcPA, 05-27-2005 00:29:53  
dry sleeve

check headgasket- very common

THaden in NW IN



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hig

05-27-2005 03:12:59




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 Re: web site for detroit diesel owners in reply to bcPA, 05-27-2005 00:29:53  
correct me if im wrong but wasnt the 71s a dry sleeve?



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buickanddeere

05-27-2005 01:29:52




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 Re: web site for detroit diesel owners in reply to bcPA, 05-27-2005 00:29:53  
Do you mean the air box vents? Pull the inspections covers on the airboxes and have a look with a flashlight.Pumping the rad to 15 psi should force the leak to show. Time to pull the sleeves and find that leaking "O" ring or that pin holed sleeve. When putting it back together use the "N" series pistons/sleeves and at most N70 injectors. The 53 seriws have updated blower seals and valve train springs. The 71 series may be upgraded as well. Don't waste time and money grinding valves and seats. That sinks the valves and lowers the compression. It will make that detroit into a worse cold weather ether eater than what it already is. New valves and seats set to max height or forget about it. Make certain the sleeve protrusion is identical on all four and at speced height.

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sphargy42

05-27-2005 05:31:38




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 Re: web site for detroit diesel owners in reply to buickanddeere, 05-27-2005 01:29:52  
The liners are dry . only leak you will find by looking in the air box is a head. just roll the piston down until the piston is below the ports . There is no problem with grinding the valve seats that I ever had. The vents that guy speaks of are air box drains and are there to keep water out of the air box in the event of a leak and to remove excess oil from the air box. Just exactly where are you getting anti freeze out of ? the breather ?

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buickanddeere

05-27-2005 22:24:48




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 Re: web site for detroit diesel owners in reply to sphargy42, 05-27-2005 05:31:38  
The top 1/3 of the sleeve in the block is wet, the 1/3 of the sleeve below the ports is dry on a cast iron block. Aluminium blocks are wet sleeve above and below the ports. If you cc a head for volume and calculate the compression ratio. Then sink all four valves by grinding the valves and seats. You can bring a N conpression engine down to a S compression ratio. An now you will have one of those &*%^&* Detroits that need ether to start even in cool weather. Happens all the time, somebody rebuilds and engine and it starts worse afterwards that it did before.

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scottf

05-28-2005 18:37:27




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 Re: web site for detroit diesel owners in reply to buickanddeere, 05-27-2005 22:24:48  
Sorry but you are not correct. The liners in the 71 series are 100% dry. Maybe you are thinking of the 92 series? I think you are exaggerating about compression lose due to grinding the valves. I have built plenty of them and checked the compression afterward. On a normal valve grind you won't notice a compression lose. You must be doing something else wrong.



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buickanddeere

05-29-2005 08:43:43




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 thinking of 53 series Re: web site for detroit di in reply to scottf, 05-28-2005 18:37:27  
Scott, you are correct. I re-read that queston again. That's a 71 series with dry sleeves. I somehow got thinking 53 series with the top 1/3 of the sleeve being wet. The smaller the diesel cu" per cylinder the more the compression loss is noticed. A two valve 71 "N" will not drop compression with sunk valves like a four valve 53 "S" series.



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