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Old 13-02-2012, 15:43   #16
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Re: Yanmar 4JH Engine Owners: READ THIS !

delmarrey,
the pump I have is different, it's another smaller bearing at the end, on the external side of the gear, and the cover have the bearing housing .. ? my engine is a old one ..
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Old 19-02-2012, 00:18   #17
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Re: Yanmar 4JH Engine Owners: READ THIS !

may all your dreams come true,great to have good sites like this
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Old 19-02-2012, 10:01   #18
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Re: Yanmar 4JH Engine Owners: READ THIS !

This thread reminded me of a parts outfit in Texas who deals
with "Yanmar Tractor" parts including selling used parts off old
tractors they buy. I have not cross checked motors/parts yet so don't know but thought I would share...

www.Hoyetractor.com
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Old 19-02-2012, 10:05   #19
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Re: Yanmar 4JH Engine Owners: READ THIS !

This thread reminded me of a parts outfit in Texas who deals
with "Yanmar Tractor" parts including selling used parts off old
tractors they buy. I have not cross checked motors/parts yet so don't know but thought I would share...

www.Hoyetractor.com Iowa Park, Texas
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Old 22-03-2018, 14:49   #20
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Re: Yanmar 4JH Engine Owners: READ THIS !

Did anyone got to order a pump from jimmy and is it a company?
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Old 25-10-2019, 05:59   #21
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Re: Yanmar 4JH Engine Owners: READ THIS !

Hello, can I take a slight detour but stay on the track of impellers please. I have a 4JH HTE and I had a hell of a job removing my old impeller, because of the restricted access I could not use a standard puller. I know Johnson make threaded impellers for extraction with a very small bolt type puller but I don't know even if they make a threaded impeller for my engine. Can anyone point me in the right direction please?
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Old 25-10-2019, 06:07   #22
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Re: Yanmar 4JH Engine Owners: READ THIS !

I am pretty sure that the Yanmar branded impellers are threaded, you may have to pay extra at a Yanmar dealer.
It may not help much but I put a very little bit of anti seize on the shaft on assembly, if you do this use it sparingly as itís a petroleum product most likely and not all rubber tolerates petroleum products
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Old 25-10-2019, 06:52   #23
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Re: Yanmar 4JH Engine Owners: READ THIS !

Quote:
Originally Posted by a64pilot View Post
I am pretty sure that the Yanmar branded impellers are threaded, you may have to pay extra at a Yanmar dealer.
It may not help much but I put a very little bit of anti seize on the shaft on assembly, if you do this use it sparingly as itís a petroleum product most likely and not all rubber tolerates petroleum products
I concur!

I lubed my impeller shaft with lots of lithium grease. And a little on the pump bore for the dry startup. And on the o-ring for the cover. Never a problem.
My Yanny came with a treaded puller but the impeller was not. So maybe they are special order.
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Old 25-10-2019, 07:17   #24
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Re: Yanmar 4JH Engine Owners: READ THIS !

Thankyou a64pilot and demarrey I will research Yanmar threaded impellers.
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Old 25-10-2019, 07:54   #25
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Re: Yanmar 4JH Engine Owners: READ THIS !

I just got a yanmar impeller for my 4JH3, it is still threaded and I finally got the right puller (after the wrong one I got off eBay)

Unfortunately the puller doesn't help a lot if the impeller got installed with the threads facing in.
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Old 25-10-2019, 08:15   #26
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Re: Yanmar 4JH Engine Owners: READ THIS !

I've found Yanmar brand impellers are often cheaper online than Johnson brand. In a pinch (no pun intended) a pair of long handled 90 degree needle nose pliers will get the old impeller out if you have a Johnson or a yanmar put in backwards.
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Old 25-10-2019, 09:00   #27
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Re: Yanmar 4JH Engine Owners: READ THIS !

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I've found Yanmar brand impellers are often cheaper online than Johnson brand. In a pinch (no pun intended) a pair of long handled 90 degree needle nose pliers will get the old impeller out if you have a Johnson or a yanmar put in backwards.


The 90 degree needle nose pliers is what I use as mine donít come threaded, but access is good on a 4JHE
In particular I found an excellent stainless steel pair of large needle nose pliers meant for fishing hook removal, they are long enough and of course being stainless pretty resistant to rust.
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Old 25-10-2019, 11:54   #28
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Re: Yanmar 4JH Engine Owners: READ THIS !

We have the same engine. Buy a Seadog puller, and cut part of the center pin off. It works great in the restricted access.



Once you get it out, apply silicone grease to the shaft, and next time it should just pop out, if you do them once a year.
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Old 26-10-2019, 12:22   #29
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Re: Yanmar 4JH Engine Owners: READ THIS !

Quote:
Originally Posted by Daedalusk View Post
Here are the part numbers for the two pumps:
Yanmar 3JH Pump Assy: 129670-42512 (Costs about $260)
Yanmar 4JH Pump Assy: 129271-42500 (Costs about $750)

You can turn the 3JH pump into a 4JH pump by either moving the drive gear and outlet connection from your old 4JH pump to the 3JH pump, or by purchasing a new gear (Part #129271-42700 for $132) and a straight discharge connection (Part #X01357681 for $22), and putting those on the 3JH pump.

Either way you have a seawater pump for the 4JH engine at half or less of the cost. Hope this will help some of your guys/gals.
Well, a lot has changed since the original posting way back in 2011.

There are new part numbers:

Yanmar 129670-42513 replaces 129670-42512 (~$500)
Yanmar 129271-42502 replaces 129271-42500, 129271-42501 (~$380)

Marine Pump Direct offers their own replacement pumps:
JPR-YM04JHA replaces 129670-42513 (~$410)
JPR-YM04JHB replaces 129271-42502 (~$350)

Interestingly, the price for the new 3JH pumps have gone way up to around $400-$500 for the 129670-42513 pump while most of the 4JH pumps are selling for around $380 complete with gears. If you have the tools and ability, complete overhaul kits for both pumps that include all bearings and seals are easily found for around $130 on Ebay and Amazon.
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Old 03-11-2019, 08:10   #30
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Re: Yanmar 4JH Engine Owners: READ THIS !

Great observation and tip!
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