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Old 26-11-2012, 14:06   #31
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We tend to pull between 3 1/2 to 4 litres out of our 4108 using the vacuum suck method. We never get 100% out, but it's quick and easy doing it this way. I put in a new oil filter every second change.
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Old 26-11-2012, 14:56   #32
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Re: Perkins 4-108 diesel

That's a great boat and good choice. Perkins 4-108 is probably my favorite boat engine. Someone here said that theirs didn't leak oil or water. Unbelievable!! Joke: That's why the Brits don't manufacture computers. Punchline: They can't make them leak oil.
No offense meant.
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Old 26-11-2012, 17:40   #33
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Re: Perkins 4-108 diesel

I have heard that a Walker Airsep reduces the oil leaks and makes it much easier to keep the engine room clean.
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Old 28-11-2012, 14:36   #34
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Re: Perkins 4-108 diesel

What's a Walker Airsep?
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Old 29-11-2012, 09:39   #35
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Re: Perkins 4-108 diesel

I found the Walker products page. Now I know.
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Old 29-11-2012, 09:54   #36
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Re: Perkins 4-108 diesel

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Originally Posted by bsankey448 View Post
I'll try sucking out the oil with my vacuum pump after I heat up the engine. How much oil is going to come out?
A vacuum oil changer with the oil container attached is invaluable. It should take out almost all the oil. Any good filter is fine. You want Diesel rated oil like Rotella or Delo.
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Old 29-11-2012, 22:03   #37
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Re: Perkins 4-108 diesel

An engine must breathe or it will blow up, on a marine engine the crankcase breather fumes are reintroduced to the air inlet manifold and get consumed by the engine. The Walker airsep separates these fumes and any oil droplets that form are returned to the crankcase, imho a waste of money. A useful modification is to fit an air filter assembly from a forklift in a dry place in the engineroom, connect it to the manifold with a hose, this will cut down the engine intake noise by approx 50% making life onboard more pleasant, you'll also be suprised at how much dirt is caught by the filter which in turn saves engine wear. Perkins Marine supply a brass hand pump and hose which is permanently attached to the engine and makes oil changing a gift without the need to carry a vacuum pump around.
I hope these wee tips help.
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Old 29-11-2012, 22:48   #38
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Re: Perkins 4-108 diesel

If ya have the room, theres drain plugs made with pump out fittings, allowing you to get ALL the oil out of your Perkins engine. Ive had them in the past ! never had it fitted up for just flicking a switch, but it only took a couple of minutes to hook up a simple pump set up. I have the same set up on the 471 detroit we have now, and it works as well as the ones on my perkins did! just a thought
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Old 29-11-2012, 23:12   #39
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Re: Perkins 4-108 diesel

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Just talked to the mechanic who did a survey on the engine. He says that a Perkins with that many hours is just about at the end of it's life span and I will need to do a re power in the not to distant future.
With all due respect, kindly tell that mechanic to take a hike. He clearly does not know this engine. The 4.108 is one of the most reliable Diesel engines in this class ever built during the era of its existence. A mechanic who knows this engine will tell you 4000 hours is nowhere close to the end of its life if the engine has been well maintained.

I repowered my boat with a Perkins 4.108 for that reason. The reliability of this engine cannot be matched. I specifically looked for this engine, drove 500 miles to pick it up, and I'm glad I did.
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Old 03-12-2012, 16:50   #40
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Re: Perkins 4-108 diesel

I had a perkins 4.108 with 13000 hours had a valve job done at 11000 no leaks and still ran good. If your engine was well maintained 4000 is half way there but if the engine runs well why would you repower some people have boats for ten year and put lest than a 1000 hours on them get your money out of the engine than repower.
Every hour on this engine is one less hour on your new engine.
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Old 03-12-2012, 17:57   #41
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Re: Perkins 4-108 diesel

7000 hrs and counting...love my perkins!
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Old 02-03-2013, 08:26   #42
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Re: Perkins 4-108 diesel

I don't know how to end the thread so people know I've got all the info I need.
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Old 02-03-2013, 08:34   #43
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Re: Perkins 4-108 diesel

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I don't know how to end the thread so people know I've got all the info I need.
No need to end it. Threads have a life of their own (absent moderator intervention). It will die when it's ready.
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Old 02-03-2013, 09:22   #44
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Re: Perkins 4-108 diesel

Thanks, that's a relief.
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Old 02-03-2013, 11:26   #45
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Re: Perkins 4-108 diesel

Or... it may never end if the word "anchor", "Catamaran", "guns" appeared! :>)
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