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1850 head gasket

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alberta dave

07-03-2003 21:58:45




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I am pulling the heads on two of my 1850 D's. When I install the new head gaskets should I be leaving them clean or using some type of gasket paste? I have been told various theories and I now find myself perplexed. I replaced a head gasket last fall and I continued to have exhaust leakage back to the rad all winter long. I did not use any gasket paste last fall. I will be replacing at least one head with a rebuilt low hour used head from my parts tractor.

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Wrenchbender

07-05-2003 05:55:01




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 Re: 1850 head gasket in reply to alberta dave, 07-03-2003 21:58:45  

Perkins had a spray on gasket sealer made for the head gasket. You hang the gasket up with a wire and spray both sides and allow it to become tacky before installing. Directions on can! WB.



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Ollie

07-04-2003 02:24:19




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 Re: 1850 head gasket in reply to alberta dave, 07-03-2003 21:58:45  
All theories are wrong. The fact is you do exactly what the gasket manufacturer recommends. Some gaskets are designed to be installed with sealer, some not. Sealer requirements differ on some replacement gaskets from those in the service manual so always do what the gasket manufacturer says.

The leakage you describe is most likely due to failure to properly surface the head. A machine shop can check the head for flatness and surface it if necessary. Other possibilities are failure to use new bolts, failure to clean the threads in the block, failure to lubricate the bolt threads with the assembly lube the bolt manufacturer recommends, failure to follow the correct stepped torque sequence, and failure to attain the correct torque values.

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antique

07-04-2003 03:49:25




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 Re: Re: 1850 head gasket in reply to Ollie, 07-04-2003 02:24:19  
Question: Do you retorque the head after it is warm?



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Ollie

07-04-2003 05:41:41




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 Re: Re: Re: 1850 head gasket in reply to antique, 07-04-2003 03:49:25  
Depends on the type gasket. Some you retorque after a stated run-in period, other are "no-retorque" gaskets.



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antique

07-04-2003 06:14:04




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 Re: Re: Re: Re: 1850 head gasket in reply to Ollie, 07-04-2003 05:41:41  
On the retorque: When I worked for a dealer we also retorqued them because it was mentioned at service school. We also found that the torque would be down about 15 pounds after the engine had warmed up. We also had a farmer who had an 1850 diesel and did his own work and didn't beleave in the retorque. After the head gasket failed for about the third time, he changed his mine and had no more problems. Perkins has also had some service bulletins out on proper torqueing procedures on the 354 engines from the 1850 version to the later dot four engines. Maybe it would be good to check my Perkins bulletins.Perkins also has more than one vendor who manufactures head gaskets for them. A few years ago when I did a few heavy duty engine clinics for a certain major parts manufactures I had some examples where the gasket failed because the installer had used improper sealant or too much sealant. Properly torqued, sleeves at the correct height, a flat head, one should not experience problems, Perkins, Waukesha or other engine manufacture. Nowdays with aluminum heads and cast blocks in the automtive world, head gasket torque and sealing has become quite different because the head and block expand at different rates.

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alberta dave

07-04-2003 18:52:14




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 Re: Re: Re: Re: Re: 1850 head gasket in reply to antique, 07-04-2003 06:14:04  
Thanks for all of the great advice. It is getting harder to find technical help on these older engines. I removed the first head this morning and found the gasket had failed between the back two cylinders causing a quarter sized section of the liner to break off at the top and an ajacent crack in the opposite cylinder. It looks like I will be doing a more major repair than previously planned. Any chance I could get away with slipping in a couple of used liners and pistons from my parts tractor?

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antique

07-04-2003 19:24:16




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 Re: Re: Re: Re: Re: Re: 1850 head gasket in reply to alberta dave, 07-04-2003 18:52:14  
That Perkins is a dry sleeve engine. Those sleeves are a tight fit, like it taks an OTC 17 ton sleeve puller to get them in an out. I would take the engine out and do it right, put new sleeves in.



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alberta dave

07-04-2003 23:30:46




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 Re: Re: Re: Re: Re: Re: Re: 1850 head gasket in reply to antique, 07-04-2003 19:24:16  
Doing the re build goes against my rather cheap and morbidly frugal ways but I have to agree that it would be the best method. I guess the tractor really deserves a little tune-up after 35 years. I have pulled the tractor out of the garage and placed it on my "healing fence" until after haying is done.



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