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-   -   Perkins 4108 massive oil leak (https://www.cruisersforum.com/forums/f54/perkins-4108-massive-oil-leak-225361.html)

simbav 16-10-2019 05:33

Perkins 4108 massive oil leak
 
Hi, I have a massive oil leak beside the oil filter. I think that it is spraying out oil when it is 3k rpm(high rpm). It's spraying around 50cm to one direction. I bought the boat 3 months ago. I didn't have the problem before. The problem started to happen when I cleaned the air filter and then it got more power (max 3000rpm before 2.4rpm) and no more black smoke. :biggrin: I think that when it got more rpm it gets more oil pressure and starts to leak. I tidied up the oil hose but it did nothing. For me, it looks like it is missing one bolt. I think that I should block that hole with a bolt with a copper washer. Because in another site that hole is blocked.
https://photos.app.goo.gl/i6Ys4zzGW3f9SMD8A
https://photos.app.goo.gl/izJHHTq5htwe79jg6
https://photos.app.goo.gl/g3KHsVVisLpnQuP99
https://photos.app.goo.gl/srKszVoL2ogjHAPt9
https://photos.app.goo.gl/izJHHTq5htwe79jg6
https://photos.app.goo.gl/g3KHsVVisLpnQuP99

In this video about 1,6k rpm no leak but I can see oil shine in the hole.
https://photos.app.goo.gl/i6Ys4zzGW3f9SMD8A
Any ideas? Thanks

Lepke 16-10-2019 13:59

Re: Perkins 4108 massive oil leak
 
Why not post images here instead of links to another site. I'm in my 70s, a member of the analog generations, and can figure it out.
The hole is probably a threaded bolt hole that passes near a pressurized oil gallery. I would guess a small hole developed. A bolt with sealer should solve the issue. Clean out the oil with some solvent/cleaner first.

Most marine engines don't have air cleaners. My 4108 doesn't. Just an air silencer. They're not expected to be operating in dusty conditions.




oldcal46skipper 17-10-2019 23:18

Re: Perkins 4108 massive oil leak
 
Have you changed the oil filter? A faulty or improperly attached oil filter can leak.

CSY Man 18-10-2019 01:20

Re: Perkins 4108 massive oil leak
 
Quote:

. max 3000rpm before 2.4rpm
You should get 4000 RPM, if not you may be over-propped.

BozSail 18-10-2019 10:41

Re: Perkins 4108 massive oil leak
 
4,000 rpms from a Perkins 4-108? Holy mackerel? That's a LOT of rpms for that engine. I have a 4-108 with about 3,500 hours on it. Runs and starts great. But I don't take it over 2,000 rpms. At that rpm, it pushes a 21,000 lb. Endeavour 37 at 6 knots. Steady 60 lbs. oil pressure, 175 degrees temp. I recently replaced the rear main oil seal (awful job with the engine in the boat). I would never take this engine anywhere near 3,000 rpms, let alone 4,000 rpms. But... to each his own.

stormalong 18-10-2019 11:00

Re: Perkins 4108 massive oil leak
 
Quote:

Originally Posted by BozSail (Post 2999087)
4,000 rpms from a Perkins 4-108? Holy mackerel? That's a LOT of rpms for that engine. I have a 4-108 with about 3,500 hours on it. Runs and starts great. But I don't take it over 2,000 rpms. At that rpm, it pushes a 21,000 lb. Endeavour 37 at 6 knots. Steady 60 lbs. oil pressure, 175 degrees temp. I recently replaced the rear main oil seal (awful job with the engine in the boat). I would never take this engine anywhere near 3,000 rpms, let alone 4,000 rpms. But... to each his own.

I had a 4-108 for many years. The specs on the engine claim 50 HP at 4000 rpm but no one I knew ran them above 2200. It is really a 35 HP engine claiming to be a 50. I replaced the 4-108 with a Beta 50 and the performance difference is amazing. The 4-108 is a 1.8 liter engine while the Beta is 2.2.

CSY Man 18-10-2019 17:33

Re: Perkins 4108 massive oil leak
 
4000 RPM is only emergency power, nobody in their right mind would run at 4000 for more than a few minutes.
That being said, you should be able to turn 4000, otherwise you are over-propped.
Max Continuous, or Max Cruise is 3000.
I usually ran @ 70% of max continous as recommended by most diesel experts: 2100.
The 4-108 is rated at 51hp @ 4000 and it will deliver, but as any car engine rated @ 200 hp, you are not supposed to run it at Max rated power continously. ��

Nicholson58 18-10-2019 17:56

Re: Perkins 4108 massive oil leak
 
These are crazy numbers from an alien galaxy. We run 900 engine rpm, 2:1 to a 24 3-blade variable pitch. Westerbeke 6 cyl, 115 Hp. Its peacefully quiet and vibration free. :smile:

Hope you figure out the leak. I would expect it to leak at any rpm. More at high rpm. Good advice above.

fivecapes 18-10-2019 19:42

Re: Perkins 4108 massive oil leak
 
Quote:

Originally Posted by Lepke (Post 2997879)
Why not post images here instead of links to another site.

OT, but OP's method is my preference. I don't want to be bombarded by huge hi res photos, especially when in a bandwidth/data challenged area. I want the choice to not view the photos.

Compass790 22-10-2019 18:29

Re: Perkins 4108 massive oil leak
 
Cant see what you have to lose by putting a bolt in that hole. Just try it.
Man I dont envy you changing the oil filter on that engine. What genius designed that?


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