Perkins 4.108M DIY Rebuild -- A Narrative - Page 18 - SailNet Community
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post #171 of 268 Old 04-07-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

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I wish I'd been around when you were rebuilding your engine. I am currently rebuilding a Perkins 4.107 and have found that the connecting rod IDs are out of limits. I'm trying to figure out what to do...I can't hone the big ends of the rods to accept oversize rod bearings because nobody seems to make them. Wish I could understand why.

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You may want to look here: Perkins Diesel


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post #172 of 268 Old 04-07-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Thank you.
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post #173 of 268 Old 04-08-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

More info on oblique cut connecting rod caps:

Because of the large diameter of the crankpin to increase bearing area and decrease bearing load, the width of the bottom end of the con rod is greater than the diameter of the cylinder liner.

So that the piston can be withdrawn from the liner, 3 different designs are used:

The con rod can be fitted with a marine palm as in the photo above.

The con rod can be split in two parts as shown opposite.

The bottom end can be split obliquely. Serrations are used to locate the two halves relative to one another.
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post #174 of 268 Old 04-08-2013 Thread Starter
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Thought I'd pass along a little news:

- My shipment from the UK arrived today ("improved" rear main seal and new Bowman end caps.)
- Also got a call from the diesel shop, seems my injector pump is ready for parole and re-entry to society (I'll pick it u[ tomorrow.)

So, all things considered I should be able to resume the narrative pretty soon!
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post #175 of 268 Old 04-08-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

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.....So, all things considered I should be able to resume the narrative pretty soon!
'bout time!! We're going into withdrawal here!
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post #176 of 268 Old 04-09-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

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Originally Posted by PorFin View Post
Thought I'd pass along a little news:

- My shipment from the UK arrived today ("improved" rear main seal and new Bowman end caps.)
- Also got a call from the diesel shop, seems my injector pump is ready for parole and re-entry to society (I'll pick it u[ tomorrow.)

So, all things considered I should be able to resume the narrative pretty soon!
Can you tell me about the new and Improved rear main seal?This project is looming in the next 6 weeks...need the real skinny!

Question, when installing the rear main seal does it go in dry or do you soak it in engine oil first? The scuttlebutt has it that if dry the seal tends to glaze and then leak quicker. Any opinions on this one?


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post #177 of 268 Old 04-09-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

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Question, when installing the rear main seal does it go in dry or do you soak it in engine oil first?
Why would this matter? It's a perkins right? So once you start it up the brand new seal (along with the rest of the engine and bilge) will be soaked in oil.


But I'm not bitter.....

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post #178 of 268 Old 04-09-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Thank you so much, PorFin, for posting your project in such detail!

I am new to the forum and am super impressed with all the information and contributors here!

My wife an I just inherited a '79 Morgan 382 with a 4.108M. The boat is in pretty good shape, but has been sitting in the yard for almost 5 years. The boat only had one owner (an aircraft machinist) who was pretty malicious about everything (including the engine). But he has passed away and I have almost no history on the boat.

Anyway, five years is five years. The engine was properly winterized way back when, but I'm still concerned about firing the Perkins up for the first time. I'm gonna replace the fuel, filters, oil, batteries, etc., before attempting to start. But, I'm wondering if there's anything unique to this engine I should be aware of before attempting to crank her up?

I know this should probably be it's own thread, but I got so caught up in your detailed rebuild, I thought you (and those following this thread) would have some good advice. Besides, if the engine proves to have a lot of issues, I'll be re-referencing all your steps as I go through the re-build process myself!

Thanks again everyone; I plan to be frequent visitor/contributor.
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post #179 of 268 Old 04-09-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

I started my 4107 after it had been sitting on the hard for several years, after being neglected for many more before that while in the water. Did just what you propose - gave it a thorough service, oil, filters, belts, hoses, fuel, pumps, coolers etc. It fired right up and chugged exactly as it should.

Those engines are about as close to indestructible as any engine out there.

Before & after pics attached to give you an idea of how far it had sunk before I started on it.
Attached Thumbnails
14 Engine before.jpg   15d Engine after.jpg  
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post #180 of 268 Old 04-09-2013
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Re: Perkins 4.108M DIY Rebuild -- A Narrative

Thanks, SloopJonB for the encouraging words. I'd say my engine looks like your "before" picture. Your "after" engine is beautiful! It's nice to know the Perkins is worth fixing up.

I've learned a lot about the 4.108 just by reading this thread. It has forced me to go through my workshop manual and (now maybe somewhat obsolete) parts book.

PorFin: You could put all your posts and pics together and make a book. I'd buy it!
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