Yanmar impeller replacement

[dlochner]

Agree, disagree, no matter. The off-brand impeller that was supposed to work did not. The Onan brand impeller did. Other than material color, they looked identical; even the tech that sold it to me agreed. One thing that I did notice was that when the off brand impeller was installed on the shaft it was exactly flush with the pump housing. The Onan brand impeller extended about 1/64", which is the correct amount. The gasket is about that thickness, which allows the impeller to press against the cover plate. The off-brand allowed just enough bypass to prevent the pump from priming.

As far as other parts go, belts, filters, etc., not much to comment. I use NAPA brand for fuel and oil filters and they seem to work just fine. When it comes to the more critical engine parts, brand seems to play a more important role, FWIW.

NAPA oil filters are made by Wix brand with a reputation for high quality filters. There YouTube videos comparing them to popular brands like Fram.

 

[Paul356]

Niemiec Marine in New Bedford, Mass., now has the Yanmar parts franchise, at least for east of the Mississippi. Call them and tell them what you've got. They will select the right impeller from among the many (dozens?) of Yanmar applications (raw water vs closed system, size, age, etc., etc.) and ship it to you promptly. Used to be an outlet in Michigan, too, but they sold or sent their business to Niemiec.

Well, I just saw you're in Washington. If you don't know the Yanmar franchise out there, I'd still call Niemiec. I may be wrong about the MIssissippi boundary, or otherwise I'm sure they'd know who has your parts.

Also, a few or maybe many years ago, I bought a Yanmar spares kit for the engine in my 356. It had a number of good items in a waterproof box, including the impeller and gasket and lube. I used that once and it worked swell. I've since replaced as part of maintenance with one I got from Niemiec.

 

[garymalmgren]

Belts.
Well. luckily the PO had already bought spare genuine Yanmar belts so I didn't have to worry about choosing Yanmar or third party parts.
The only thing that has me confused is the actual brand on the belts.

 

[dlochner]

Belts.
Well. luckily the PO had already bought spare genuine Yanmar belts so I didn't have to worry about choosing Yanmar or third party parts.
The only thing that has me confused is the actual brand on the belts.

Yanmar uses other manufacturers to produce some Yanmar parts, belts, hoses, filters and probably more. These are simply rebranded parts. It is a common practice. It appears your Yanmar belts were made by Mitsubishi, as you know a large conglomerate that makes all kinds of things, apparently V-belts are among them.

East Penn Battery produces batteries under its own brand, Deka, as well under the NAPA brand and I think some West Marine batteries. Wix sells fuel and oil filters under its own brand as well as NAPA. There are many others.

 

[Ralph Johnstone]

luckily the PO had already bought spare genuine Yanmar belts

That's strange. You'd figure Mitsubishi would produce a good product. Maybe they are today.

Got to wonder what Yanmar was using back in 1998 when my boat was built and I received it. First thing I noticed after the first 50 hours was a fine deposit of belt dust on the engine. The alignment was good so it had to be cheap belts. I remember looking at the belts and could not see any brand name. Went to Gates and never saw a speck of dust again. I've seen a number of reports here complaining about belt dust from Yanmar belts.

I guess with the passage of time, Yanmar moved up to a better belt (Mitsubishi).

@garymalmgren , are you presently using Yanmar belts on your engine and are you seeing belt dust ?

 

[DougM]

There is no such thing as a ”Yanmar” belt. At the time the engine is manufactured, the accessories like the water pump, belts, etc. all come from a tier one or tier two supplier. Often that is the low bidder. For spare parts, Yanmar in house purchasing would order a quantity specifying that the packaging be labelled accordingly, and then marked up for over the counter retail sale.

As for belt dust, the primary causes are the belt is not tensioned enough and is slipping under load, and/or the belt cross section doesn’t match the pulley profile.

 

[Ralph Johnstone]

As for belt dust, the primary causes are the belt is not tensioned enough and is slipping under load, and/or the belt cross section doesn’t match the pulley profile.

And when the belt tension is correct, and the belt cross section does match the pulley profile, and the alignment is correct, what causes the belt dust. ?

 

[dlochner]

And when the belt tension is correct, and the belt cross section does match the pulley profile, and the alignment is correct, what causes the belt dust. ?

Age and quality. Rust or a rough surface on the pullies.

 

[Ralph Johnstone]

No age or rust as it's a new engine. No rough pulley surfaces as it's a Yanmar.

Hence, the cause of the dust is quality. Yanmar back then (now is an unknown) used "low bidder" quality as per @DougM 's theory.

 

[Benny17441]

We know Yanmar don't make impellers but with their brand name on the line you can be sure the manufacturer is held to certain specs and quality.