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Old 19-08-2014, 19:50   #16
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Re: Perkins oil leak fix

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Originally Posted by Curtis Shipp View Post
I will let you know how it goes. I am delayed going to the boat due to work. I think it will work due to the fact it is made like the small block chevy seal and they do not leak for 200,000 miles. Will let you know as soon as possible.
This is confusing. I thought you were trying to come up with a 1 piece seal for the 108. I am not sure what small block Chevy you are talking about. Perhaps I am to old but the SB chevy I remember had a 2 piece seal.
This whole thread is confusing. The 107 has a different seal set up than the 108. Only the 108 can have a 1 piece seal even though it comes with a 2 piece seal. It has to do with the shape of the flange. I don't see any connection to a Chevy in any shape or fashion. Ford maybe.
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Old 20-08-2014, 03:38   #17
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Re: Perkins oil leak fix

Guy, a chevy small block can use a 1 or 2 piece seal depending on year. The seal I will use is a 1 piece. The reason for the chevy type reference is to let people know what style seal it is. It is a 1 piece lip seal that goes in the 2 piece housing to cure the perkins leak. If you want to come to Alabama I will show you what it looks like.
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Old 19-11-2014, 17:18   #18
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Re: Perkins oil leak fix

This is an update on the perkins seal. It has taken longer than I thought due to lack of information. I finally found a perkins shop in Pensacola that has helped me with dimensions. I am having seals made as I type this. The new housing will be made by Wednesday next week. I will be going to marathon, fl shortly to install them. I have a price of about $250.00 this will be the 3 seals and 1 housing. The extra seals are so you can keep them in case you rebuild your engine later. The billet housing will be thicker and stronger then a stock casting and more precise. This has been a long road but maybe I am seeing the light at the end of the tunnel. So don't give up. Hopefully we can all keep a good motor in our boats if this works. These will also work on a 4.107 and 4.99.
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Old 19-11-2014, 18:02   #19
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Re: Perkins oil leak fix

You guys have me totally confused. It's a Perkins 4-108, right? It's supposed to leak oil! In fact, it is my understanding that the British don't build computers because they have not figured out yet how to make them leak oil.

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Old 19-11-2014, 18:57   #20
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Re: Perkins oil leak fix

The aft end of a 4-107 crankshaft is totally different than the aft end of a 108. There is no way a seal for a 108 will fit on a 107.
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Old 19-11-2014, 19:36   #21
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Re: Perkins oil leak fix

Common ....off the shelf in NZ ,comes with what they call a seal saver ,basically a thin metal sleeve that locktite on the crank and a neoprene seal kit ,simple , i've done a couple in the cook islands on 108 perkins
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Old 19-11-2014, 19:56   #22
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Re: Perkins oil leak fix

Foley carries improved design seals for the 4.108, theyre just over a hundred bucks.I remember reading an article that was titled "Not your grandpas 4.108" They were selling seals, improved breather, positive crankcase ventilation and other improvements.
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Old 20-11-2014, 16:42   #23
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Re: Perkins oil leak fix

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Originally Posted by Guy View Post
The aft end of a 4-107 crankshaft is totally different than the aft end of a 108. There is no way a seal for a 108 will fit on a 107.
Guy, the 4.99 came first. The 4.107 came second based on the 4.99. The 4.108 came 3rd based on the 4.107 but with dry sleeves. The 4.108 was first called a 4.107DL for dry liner. All of the cranks are the same, this is from the Perkins web site. You are thinking of the later cranks like a 4.256.
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Old 20-11-2014, 16:59   #24
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Re: Perkins oil leak fix

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Foley carries improved design seals for the 4.108, theyre just over a hundred bucks.I remember reading an article that was titled "Not your grandpas 4.108" They were selling seals, improved breather, positive crankcase ventilation and other improvements.

That would be this one

Not Your Father's Perkins 4108; Bringing the Perkins 4108 into the 21st Century | Foley Engines
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Old 20-11-2014, 17:11   #25
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Re: Perkins oil leak fix

I think Foley is just selling better rope material. Curtis is trying to come up with a neoprene seal.
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Old 20-11-2014, 17:14   #26
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Re: Perkins oil leak fix

I have looked at the Foley seal. As rope seals go it is ok. It is not a rubber lip seal like all cars use today. Ropes were ok before EPA. Now that we have them we need to seal the engines better. The only reason I am doing this is if it works my Perkins will not need to be replaced by a high dollar Kubota or Yanmar. These are good engines but I do not want to spend my money on one.
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