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-   -   Perkins 4-108 oil leaks solved (https://www.cruisersforum.com/forums/f54/perkins-4-108-oil-leaks-solved-188370.html)

jfhspike 10-02-2020 18:23

Re: Perkins 4-108 oil leaks solved
 
1 Attachment(s)
I agree -- if you're getting a quart of new liquid in the sump in not-too-many minutes of running, it HAS to be salt water, because otherwise you'd be losing about half your coolant supply at the same time. And if it's not coming in through the oil cooler, it's gotta be coming through the raw water pump.

The good news is that it's pretty easy to pull the pump -- remove two hoses, undo four 1/2 or 9/16 nuts, slide the pump off its studs. The next piece of good news is that those parts-4-engines folks have a rebuild kit for it that's not too expensive (https://www.parts4engines.com/perkin...-service-kits/). OK, so the overhaul kit...it'll set you back $100 bucks, plus the VAT and shipping...say $150. THat's a lot less than you'll be paying your mechanic. And it gets you a new shaft, the bearing and two seals, a new cover plate (worth its weight in gold, because it'll let you keep the old one as a spare), etc.

The bad news is that it's only the right service kit if your pump looks like this: https://www.parts4engines.com/perkin...aw-water-pump/ (6 screws on the cover plate gives it away); the part number is JABSCO-3270-0001. New pump is about $430 from maringpartssource; service kit from them is about $45, but doesn't include the new shaft or cover or the alignment tool.

The alternative is the Jabsco G65, whose cover has four screws, with a pricetag of $550 (!). Marine-parts-source sells a rebuild kit for that (bearings, seals, spare impeller) for $98, but that doesn't get you a new shaft or cover either.

Definitely check the weep hole. There should be at least one, and probably four, located around the shaft roughly where the red arrow is pointing in the attached diagram. As I said, use a toothpick or drill bit to clean it out, and then watch for water pouring out through it when the engine's running.

I'm betting dollars to doughnuts you'll see it coming out there (and as a result, you'll be getting less into your sump!), and you'll know what to do next.

jfhspike 10-02-2020 19:35

Re: Perkins 4-108 oil leaks solved
 
By the way, it worries me a little that your mechanic hasn't thought of this route for water-entry. It's possible he's not as good as you think he is. :( [Sigh.]

rbk 10-02-2020 20:36

Re: Perkins 4-108 oil leaks solved
 
Quote:

Originally Posted by jfhspike (Post 3072243)
I agree -- if you're getting a quart of new liquid in the sump in not-too-many minutes of running, it HAS to be salt water, because otherwise you'd be losing about half your coolant supply at the same time. And if it's not coming in through the oil cooler, it's gotta be coming through the raw water pump.

The good news is that it's pretty easy to pull the pump -- remove two hoses, undo four 1/2 or 9/16 nuts, slide the pump off its studs. The next piece of good news is that those parts-4-engines folks have a rebuild kit for it that's not too expensive (https://www.parts4engines.com/perkin...-service-kits/). OK, so the overhaul kit...it'll set you back $100 bucks, plus the VAT and shipping...say $150. THat's a lot less than you'll be paying your mechanic. And it gets you a new shaft, the bearing and two seals, a new cover plate (worth its weight in gold, because it'll let you keep the old one as a spare), etc.

The bad news is that it's only the right service kit if your pump looks like this: https://www.parts4engines.com/perkin...aw-water-pump/ (6 screws on the cover plate gives it away); the part number is JABSCO-3270-0001. New pump is about $430 from maringpartssource; service kit from them is about $45, but doesn't include the new shaft or cover or the alignment tool.

The alternative is the Jabsco G65, whose cover has four screws, with a pricetag of $550 (!). Marine-parts-source sells a rebuild kit for that (bearings, seals, spare impeller) for $98, but that doesn't get you a new shaft or cover either.

Definitely check the weep hole. There should be at least one, and probably four, located around the shaft roughly where the red arrow is pointing in the attached diagram. As I said, use a toothpick or drill bit to clean it out, and then watch for water pouring out through it when the engine's running.

I'm betting dollars to doughnuts you'll see it coming out there (and as a result, you'll be getting less into your sump!), and you'll know what to do next.

Sherwood G65 not Jabsco.


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