Universal Engines 5424 or the other 5424

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Mitch

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Oct 22, 2008
21
Oday 34 Lk St Clair
Hello all. The boat was launched today.:) Much more to be done. As this is my third season with a boat, I still have a lot to learn. One thing I'm learning that's not mentioned here is about cars. My boat is about 2 hrs away and you can only cram so much stuff in a Pontiac Vibe or Jeep.:) I may have to buy a van. I guess that is part of the expense.

Anyway, my raw water pump has a small drip behind it. The marina says I should think about replacing it soon. The engine is a Universal 5424. The boat a 1982 34' O'day. I stopped at a local marine store, not the big WM. He made a phone call and the price was $529. Ok I told him, I'll think about it. I have an Oberdorfer pump. I then checked with Torresen. About the same price. But, the pump is totally different. (Shaft different. Won't fit at all), I got a parts list from Torresen when I bought the boat, but they send me a manual for the M4-30. Same engine they say. But the pump is a Sherwood. Anyway, I did find the right pump for $230.

Now. Can I assume that some boat engines had big changes during production and nobody cared about tracking changes? I have the original operations manual that came with the boat and has a pic of my pump. But all 5424 part list I see show the different pump that won't fit. Would I have been stuck with a $500 pump that won't work because my 5424 has an entirely different pump? One web site had a title "UNIVERSAL ATOMIC DIESEL PARTS LIST". Parts listed included cap, rotor, condenser, spark plugs, wires. 30 years in the automotive field and I've never seen a gas & diesel engine. Do I have to remove the engine and carry it to the store to show them the part I need and which model 5424 I have? Well, its late, this is getting long, so many thanks for all your help and wisdom.
 

CalebD

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Jun 27, 2006
1,479
Tartan 27' 1967 Nyack, NY
Thank the marketing wizards at Universal for most of the confusion here.
Universal made a 4 cylinder gasoline engine they called the Atomic 4 which is what is sitting in my boat right now. Around the same time as your boat was made Universal began focusing more on diesel engines but they kept the 'brand name' Atomic on a few of their engines (5424, M-35, whatever).
I am pretty sure a friend of mine has a 5424 or similar diesel in his Endeavor 32'. It has an Oberdorfer RAW water pump running off the belt AND it has a fresh water cooling/anti-freeze pump and naturally it has a heat exchanger. It is likely that you do have 2 entirely different pumps on your engine and the Oberdorfer type is around $200+ while the other one is more like $500+.
My Atomic 4 uses the Oberdorfer pump as well but is only raw water cooled so only 1 pump.
 

Bob S

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Sep 27, 2007
1,813
Beneteau 393 New Bedford, MA
My M25XP manual show three different options. Figure out what's on there now and cross it to a replacement. I just did it changing from a Sherwood to an Oberdorfer. Just make sure the type of drive is correct. Male or female. Isn't it fun working on a boat. :dance:

BTW the Oberdorfer pump housing flange didn't quite fit because of a cover that protruded of the face of the engine block. I think it is an idler adjustment bolt? Either way I had to grind a 3/16 notch in order to align the hole pattern.
 
Feb 26, 2004
23,358
Catalina 34 224 Maple Bay, BC, Canada
Usually the Oberdorfer RAW water pumps are engine dirven, not belt driven. The fresh water cooling recirculating pumps are belt driven.
 
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