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Old 20-07-2012, 22:36   #16
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Re: Perkins 4107: Rebuild or Replace??

I also go for the rebuild. I'm in the middle of a rebuild of my own Perkins 4-107. I sent the head to Hill Head Shop in Seattle, WA to have new valve seats pressed in.
New sleeves and bearing through out. It's not completely back together yet but it should last me a long time .... at least the the plan.
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Old 22-07-2012, 21:48   #17
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Re: Perkins 4107: Rebuild or Replace??

We're leaning towards a total repower at this point. Our long term goals have use shoving off for much further shores than mexico in the (hopefully) near future.

Either way, rebuild or replacing: I gotta get this damn thing outta the bilge and to my shop. Working at the slip it's been slow, but I'll hopefully have it out tomorrow. Need to rewire while I'm at it. Nothing criminal, but convoluted.

Pix pending. Something hillbilly is gonna be required for me to get this thing from the bilge to the dock. Even with the tranny and accessories off I figure 300lbs? Probably use the boom if I can get comfortable with the idea.
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Old 22-07-2012, 23:28   #18
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Re: Perkins 4107: Rebuild or Replace??

I recommended that when you do the motor rebuild, do the gear box as well.
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Old 23-07-2012, 02:13   #19
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Re: Perkins 4107: Rebuild or Replace??

I can tell ya from a Mechanics point of view,,,if your dead set on repowering (something i think is overkill) then stay with the same series engine.
Or open up Pandora's box of head aches.
Personally i would just put a rebuilt head on her after a thorough inspection of your bottom end, and save yourself some grief.
The Perkins has a well deserved GOOD reputation.
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Old 23-07-2012, 03:05   #20
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Re: Perkins 4107: Rebuild or Replace??

The 4.107/08 is a widely used engine that served all sorts of automotive/industrial as a source of power.
The main failure is the weak cylinderhead - if the engine drops out it is in most cases due to the cracking of the head. Which leads inevitably to a costly repair.
The engine is quite outdated and there is no guarantee at all that a rebuild will save you from further misery.
I would opt for a Beta, Nanni or similar engine. Get a suitable marinised powerplant, not a piece of automotive transplant.
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Old 23-07-2012, 09:24   #21
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Re: Perkins 4107: Rebuild or Replace??

you can find parts for 4-108 in mexico. the 4-107 has wet sleeves in all models, and 108 does not have same. is slightly different engine-same block and some accessories, but starter is different and some other parts, as you will see if you interchange them as i have..LOL....the 4-108 is used in many fishermans rigs here and is readily repaired and replaced if you so need.
i left sd with a used 4-108 and i am very very happy--we finally got the air knock to be gone by repairing a fuel line tubing, and she purrs sweetly now. i even have gauges and redundant gauges mounted over engine doghouse--this is heaven.
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Old 07-08-2013, 12:11   #22
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Re: Perkins 4107: Rebuild or Replace??

Does the OP have any update on final engine choice and outcome?
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Old 07-08-2013, 13:14   #23
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Re: Perkins 4107: Rebuild or Replace??

Malbert73 ... they did a re-power with, if memory serves, a Yanmar. I bought their old engine. It's very rebuildable. Needs a new head as theirs was cracked. It has new sleeves, pistons, newly machined crank ... the works. They could have saved a lot of headache by just getting a new head or a used one and sending it to Hill Head Shop in Seattle and having it rebuilt. Heads is all they do. They grind out the old seats and press in new, harder seats.
Are you interested in the old engine? I need to get rid of it and the Borg Warner transmission.
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Old 07-08-2013, 13:45   #24
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Nope- not currently. My boat has a fairly new yanmar. Know someone with old 4-107 thinking of re powering...
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