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Old 02-05-2014, 18:30   #1
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Perkins 4108 Question

was running engine at idle at the dock few days ago and it stalled out and shut down. first i thought i ran it out of fuel, but gauge still reads 1/'4 tank and fuel still in filter and water separator and fuel pump, so i thought humm maybe Hydro lock, i removed all 4 fuel injectors, no signs of water, i checked the oil, ok, engine did not heat up, water ok. just stalled and seized up. cannot even turn engine with a breaker bar while standing on it 250Lbs...so i poured some fluids IE mystery oil and PB blaster down the fuel injector ports and i will try again to turn over after 24 hours...so what happen? i dont know ...motor just gave up..any ideas suggestions or recommendations would be appreciated. other wise i am going to look at having her rebuilt or replaced with another 4108/..maybe little newer than 1979..
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Old 02-05-2014, 18:50   #2
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Re: Perkins 4108 question

Did you notice the oil pressure before the lockup?

You say the engine did not heat up. Do you mean it didn't overheat or it did not warm up at all? Did you check the temp? Did you verify water was pumping out the exhaust when the engine was running?
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Old 02-05-2014, 19:01   #3
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Re: Perkins 4108 question

Yes water was pumping out of exhaust, no i did not notice oil pressure gauge, but i did monitor temp and never went higher than norm, there was no loud noise, knocking etc, engine just slowly shut down and locked/seized up. i was at dock just letting motor run to recharge battery and make sure all was good cause i was suppose to move it to another marina...
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Old 02-05-2014, 19:38   #4
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Re: Perkins 4108 question

Just because you check the oil level OK doesn't mean it was pumping. Sounds like no oil to the mains or rods lower ends to me. When was the last time you changed the oil filter? I think you have a blockage somewhere.
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Old 02-05-2014, 19:38   #5
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Re: Perkins 4108 question

Sounds like something inside might have let loose, connector rod etc maybe... I was on a delivery with a Universal 30hp and it did something similar, no knocking no indication anything was wrong and it just quit.. It wasn't until we tried to turn it over that we knew something bad had happened.
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Old 02-05-2014, 19:46   #6
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Re: Perkins 4108 question

well if it is as bad as it seems so far, looks like i will be doing over haul. filter was due for change, and im sure oil flow had something to do with it, just thought it was very strange oil is not burnt smell and there was really no indicators, just failure, thought these motors were just about bullet proof, anybody have a good resource for affordable rebuilt perkins 4108, my trans i know is good, i also have a spare Borg warner. ...
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Old 02-05-2014, 19:47   #7
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Re: Perkins 4108 question

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Originally Posted by Chasing Summer View Post
Just because you check the oil level OK doesn't mean it was pumping. Sounds like no oil to the mains or rods lower ends to me. When was the last time you changed the oil filter? I think you have a blockage somewhere.
if i get the motor freed up and change oil and filter fews times is this engine salvageable?
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Old 02-05-2014, 20:05   #8
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Re: Perkins 4108 question

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if i get the motor freed up and change oil and filter fews times is this engine salvageable?
Ha Ha Ha! Whishful thinking. Just about the time you get to the edge of the reef, it will quit.
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Old 02-05-2014, 20:05   #9
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Re: Perkins 4108 question

forget about it up. Something is wrong inside. Pull the engine, turn it over and look at the crank bearing. Maybe the oil pickup is covered with sludge. You should be able to rebuild it. Buying a used, that's exactly what you already have. If you don't need sleeves the rebuild is very straight forward.

While you have the engine out so a depth check on your valves. People grind the valves beyond the tolerance and then the engine has low compression and smokes. Would be a good time to have new seat put in the head. All my contacts are in Seattle, WA if you need them
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Old 02-05-2014, 20:15   #10
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Re: Perkins 4108 question

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Originally Posted by saylor240 View Post
if i get the motor freed up and change oil and filter fews times is this engine salvageable?
If you are going to pull it out for rebuilding, and there is no sign of water in the oil, why bother with new oil and filters? You are not thinking of doing this and just running it? That would probably a good way to make it un-savageable. You need to figure out why it stopped and is stuck.
Parts4engines in the UK is a good source for Perkins parts
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Old 02-05-2014, 20:19   #11
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Re: Perkins 4108 question

That's what I love about these little engines ... parts were made all over the world and are still sitting in a lot of countries. When I rebuilt my engine the piston boxes all said Made in Poland. I forget where the sleeves were made.
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Old 02-05-2014, 21:02   #12
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Re: Perkins 4108 question

So far it does sound like the evidence is pointing to low oil pressure and if that's the case, the bottom end of the engine is toast.

Does the engine have an audible low oil pressure alarm? When you first crank the engine do you hear an alarm for a few seconds until the pressure builds up?
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Old 02-05-2014, 21:08   #13
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Re: Perkins 4108 question

People are always asking what the HP is on a 107 & 108 ... here is a page from the shop manuel. ... I hope ... I guess it worked ... you just have to click the link and open it.
Attached Files
File Type: pdf Perkins tech data.pdf (143.0 KB, 57 views)
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Old 02-05-2014, 23:47   #14
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Re: Perkins 4108 question

I've posted several Perkins 4-107/108 & Borg Warner Velvet Drive Manuals on my blog ... they are public domain ... feel free to download them. ... or go directly to my Google Drive page

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https://drive.google.com/folderview?...3M&usp=sharing
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Old 03-05-2014, 01:08   #15
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Re: Perkins 4108 question

Trans Atlantic Diesel in Virginia is probably closest to you. http://www.tadiesels.com/
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