Yanmar 3gm30f
serial number 12100
Can't figure out the year anyone know how to?( I've got no hr meter and the p.o. said he thinks a 1991 but he has no idea. So I'm down to the
serial number to figure it out the boats a 1977 downeaster 32. So I do know it's not original)
I just destroyed my
water pump">raw
water pump and wasted a few hundered in
parts. Put the bearings on the new shaft and forgot the clip that goes in the middle . Did a good job they're seized on the shaft now, also bent the
race or flange where the
shaft seal sits impeller side. Great job! Any how totally disgusted I'm just gonna buy a new
pump and keep what's left of the old one as spares.
The
pump I have has the shaft with the woodruff key not the through bolt. There's no numbers on the face plate. All I can figure is it's
yanmar grey and has the woodruff key which tells me its Part #721575-42701 which was replaced by 721575-42702.I'm having pinning down the Johnson pump number that cross-references that. I've found There's also a different pump that goes on the European model that has a through bolt rather then the woodruff key. I've got so many windows open with pumps and
parts I'm not sure that number my heads spinning. I've read conflicting info on if they are interchangeable or not. No one has
mentioned the flow rates .and i can't say this is the one that should be in the 3gm30f (previously replaced incorrectly or not). But after reading ;
Solved! Overheating Yanmar 3GM30 due to Johnson raw water pump not priming.
I'm really want to get the right pump.
Before I ever ran the
motor ( I've owned her a year) I noticed the pully was sloppy on the shaft and the hole in the pulley( which is flattend on the sides) was rounding out and almost stripped allowing the shaft to spin inside the pulley. So I just replaced the pulley. Shame on me for not inspecting the shaft in which it sat. So the new pully installed ( with no noticably slop) after a few day trips I started to over heat. Well the new pulley is stripped and so is the shaft slightly. Some flat washers and
epoxy lots of curses and drill bits thrown
overboard I was able to get back in.
So I can only assume one or all or any combination of ; I never noticed the shaft was starting to strip and just by adding the new pulley it was a matter of time until it stripped out the pulley due to improper seat, I had the belt to tight, or the washer behind the pulley is wrong thus pulling it out of alignment and eventually failure,and or it's a bad design. But it's all apart now and scatterd so I can't investigate further into the cause. I'm getting the feeling it's a poor design is one of the contributing causes.im just gonna get a new one. I think
anchor makes a replacement and so does Johnson. Which is the best design any testimonials?google searching has lead me down so many roads I'm not sure what road I started on.
After ordering the new parts I noticed the washer behind the pulley and the one in front some drawings have them slotted to mate into the slotted shaft and some diagrams have just flat washers. I can't see either or making a difference? If so what washers do I need?
Long winded but jeeezz can this be this confusing or have I been up way too long!
How to identify year of
motor?
What pump is supposed to be on the 3gm30f( not the European)?
Is there a difference other between the euorpean and
Japan pumps other then the shaft ie are they interchangeable?
Is there a Johnson or any other options to interchange that are a better design?