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Perkins 4108 rebuild progress

pmf44

Member
I had posted in 2020 about options for my good old Perkins which had been slowly getting worn out....and we are now almost done with the rebuild. We pulled her out in December and have since taken everything apart and broken it down. Fortunately there were no major surprises or stumbling blocks. Chris Oliver of Portside Marine in Annapolis and I have replaced the pistons, rings and re-connected the rods to the crankshaft; the reworked valve assembly and injectors are awaiting reinstallation. We will be replacing the old notorious, rear seal "rope" with a fancy and exorbitantly overpriced gasket (supposedly new and upgraded and looks like nothing more than shaft stuffing), changing the v-belt to a serpentine belt and will be replacing the unwieldy "P.I.T.A" secondary double-clamp style fuel filter with a new spin-on cartridge which required replacing the oil cooler to make room for the conversion kit. We hope to complete the rebuild and shop test her in the next two weeks and reinstall into Non Sea Quitter by mid-March. We'll be running the new ignition and fuel-cutoff stop switch from the bridge deck closer to the helm. The only rather irritating thing about the engine remains the nearly impossible to-get-to 3/8 bleedscrew on the governor/injector pump assembly. (I hope I described that properly) ....I will have some photos to share in March if anyone is interested....Portside happens to have another 4.108 in the shop! Want to buy it? Cannibalize it???
 

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MDHazel

New Member
Chris is a great guy and I'm sure you learned a lot from him. Is he still only wearing shorts even in the winter?
 
please send along the photos of your work. Galileo is in rock hall at Haven Harbour. This year they are doing a variety of patchwork tasks to keep the Perkins 4108 alive and well.
The thing that drives me crazy is the amount of smoke at startup. I wait for the wind to blow in the right direction so I don’t smoke out the neighboring boats on our dock.
Any suggestions for eliminating or mitigating this?
Steve
 

pmf44

Member
Chris is a great guy and I'm sure you learned a lot from him. Is he still only wearing shorts even in the winter?
ND HAZEL Thanks You may be referring to Chris Oliver Sr who I worked with since 1984. Chris Sr died a year ago and there was a service for him at Eastport Yacht Club. I am working with Chris Jr who owns Portside marine. Going over today to finish up. I hope. What is your first name? I will tell him that you wrote. thanks
 

pmf44

Member
please send along the photos of your work. Galileo is in rock hall at Haven Harbour. This year they are doing a variety of patchwork tasks to keep the Perkins 4108 alive and well.
The thing that drives me crazy is the amount of smoke at startup. I wait for the wind to blow in the right direction so I don’t smoke out the neighboring boats on our dock.
Any suggestions for eliminating or mitigating this?
Steve
Stephen Yes! Only start her up at anchor and warn everyone downwind!!

I don't dare call myself a mechanic but I have a few notions. Of course your engine is likely to be quite old and so smoke at startup may be "normal" to a certain extent, but could be indicative of many internal issues, but is possibly and likely the product of fuel not being burned properly--or an issue with the exhaust manifold/system??? . Although I have learned a bit--and only a bit, what I do know is that this problem will not correct itself magically, will only get worse with use and may eventually cause undue wear or internal problems that could become costly and downright complicated over time. It does not mean she is in intensive care or on life support of course....but you get my drift. There may be a few ways to relatively easily begin to analyze and correct--it may mean a valve job, an injector job, a new gasket??? But eventually....more serious work. Think Occam's Razor! Bring her down to Annapolis, and pay a visit to Portside Marine, and soon you'll be able to start up, see and listen to a newly rebuilt 1980 4.108 in a 1980 boat...all it takes...time...money...time...money...time..money--Or--get your local mechanic to come aboard.
 
I like your first suggestion,which is, in reality, what I do. Wait for the wind to blow the smoke away from the other boats, let her run til it clears. The mechanics at haven Harbour have suggested an additive to the fuel which can lessen the smoking. Another suggestion was using a block heater to keep the engine ‘warm ‘ thus increasing more efficient fuel burn.
thanks for your input. All else fails, I’ll cross the bay and visit annapolis. Just stay upwind. Occam’s razor meets Hobson’s choice!
 

MDHazel

New Member
ND HAZEL Thanks You may be referring to Chris Oliver Sr who I worked with since 1984. Chris Sr died a year ago and there was a service for him at Eastport Yacht Club. I am working with Chris Jr who owns Portside marine. Going over today to finish up. I hope. What is your first name? I will tell him that you wrote. thanks
Yes, It has been a while and yes, I was referring to Chris Sr. I'm sorry to hear that Sr is no longer with us. He was a character and I learned so much from him. Not sure if I ever worked with Chris Jr., but Sr did work on our former boat.

Our home port is Galesville, but currently on the Tennessee River. Name here is Mark Hazelden aboard S/V Simple Pleasures 382 #005
 

dave_a

Dave Ahlers
please send along the photos of your work. Galileo is in rock hall at Haven Harbour. This year they are doing a variety of patchwork tasks to keep the Perkins 4108 alive and well.
The thing that drives me crazy is the amount of smoke at startup. I wait for the wind to blow in the right direction so I don’t smoke out the neighboring boats on our dock.
Any suggestions for eliminating or mitigating this?
Steve
Steven, my boat did that too. I fixed it by the following:
Pull your injectors out and have them rebuilt.
Adjust your valves to spec.
Have an additional fuel filter prior to engine. Racor 500 is ideal w/10 micron filter.
Have your fuel tank cleaned out / fuel polishing. Old boats have crap in their tanks. It destroys your injectors.
Use Biobor /Standyne biocide & a fuel conditioner to add lubricity to today's low sulfur fuel.
 
Dave, thanks for your input. Each makes sense in terms of the age of the boat and the perkins. We don’t run these engines long enough to help them either. Just to get us from the slip to the open water, and then shut them down. Never use a full tank of fuel, so who knows how old the ‘stuff’ in the tank is.
thank you
steve

 

dave_a

Dave Ahlers
Steve, search for a picture from moderator Mark Pearson to see what he found in his tank. Many diesel boats get in rough seas, bounce around enough to dislodge that tar & dead microbes and clog the filter. Just what you need in an inlet or the "old lee shore". A dead engine!
So clean fuel can be a safety issue as well.
 

pmf44

Member
Yes, It has been a while and yes, I was referring to Chris Sr. I'm sorry to hear that Sr is no longer with us. He was a character and I learned so much from him. Not sure if I ever worked with Chris Jr., but Sr did work on our former boat.

Our home port is Galesville, but currently on the Tennessee River. Name here is Mark Hazelden aboard S/V Simple Pleasures 382 #005
Feel free to contact when you return to Galesville, which is where I bought and ssailed my boat for four years.
 
The Perkins in my boat smoked and put a sheen out even after 15 min. or so. Always a hint of smoke after fully loaded. Smoke increased up in the 3600 RPM area. After studying writings online, here, and talking to a fuel pump mechanic, Roy's Diesel, in Jacksonville, it was apparent that advancing the pump timing slightly might improve the burn phase of the cylinder cycle. I advanced the timing about 2.5 degrees. I'm thinking that the gear train tolerances are approaching higher values, with a retarding effect on timing at the fuel pump shaft. At first startup there was only about a 5 sec. puff and virtually no smoke through the loaded RPM range. No sheen either! thought I had an oil burning issue, but it was unburned, atomized fuel. Noticed a change to lower vibration too.
 
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