Yanmar 1GM10 impeller

[RMC]

The previous owner of my last boat had replaced the original screws with ss socket headed machine screws. An Allan key with ball end could then be used for the screw behind the pulley. Always carried spare screws and impeller. New boat has a speedseal cover ?

 

[JumbleDuck]

As already suggested a Speedseal is the answer to leaky front plates on that engine. It is a really bad bit of design with silly little bolts, one hidden behind the pulley. The slightest leak and the oil pipe underneath corrodes and the front timing cover gets eaten away.

Pirtek made me two rubber (you know what I mean) hoses to replace Mr Yanmar's joke mild steel ones for £35 the pair, done while I waited.

 

[Tranona]

Pirtek made me two rubber (you know what I mean) hoses to replace Mr Yanmar's joke mild steel ones for £35 the pair, done while I waited.

Would have done the same with mine if I had kept it but fitted new steel Yanmar ones when I repaired the damage done by the earlier leaks.

 

[Sniper]

Pirtek made me two rubber (you know what I mean) hoses to replace Mr Yanmar's joke mild steel ones for £35 the pair, done while I waited.

I wonder if they could make me up a timing cover for the same reason?

 

[nemodreams]

Make your life easier and take the pump off. Three bolts. Its very likely dripping at the seals. They are easy to change - and cheap. about £2 each from Simply Bearings.

Easy unit to strip apart - one circlip. Even if the shaft is showing some scroring - new seals work fine - just need changing more often.

I really do not know why people stuggle with this pump when it comes off so easily ! With the pump off you can properly check the impellor is right, cover etc - and the state of inlet and outlet spigots ( they tend to fur up a bit )

I did my impellor in situ once - and never again.

 

[peterhull]

Have another careful look at where the water is coming from. It could be pump seals. Wear on the shaft causes the the seals leak eventually.

It was some years ago but I had this problem with a water pump. Basically the pumps tend to come from the same place. In the end it was better and more economic to fit a reconditioned pump.

Try Aquafax for spares for Johnson / Jabsco pumps if you need any.

 

[Tranona]

Have another careful look at where the water is coming from. It could be pump seals. Wear on the shaft causes the the seals leak eventually.

It was some years ago but I had this problem with a water pump. Basically the pumps tend to come from the same place. In the end it was better and more economic to fit a reconditioned pump.

Try Aquafax for spares for Johnson / Jabsco pumps if you need any.

The 1GM pump is unique and nothing like the pumps you refer to.

 

[Tranona]

I wonder if they could make me up a timing cover for the same reason?

I refurbished mine as corrosion from the leak had got at it and the mild steel screws that attach it to the block. Took the seals out of the cover and had it bead blasted, filled the pitting with an aluminium epoxy filler then etch primed and powder coated. Bit or Yanmar spray paint and it looked like new. only tricky bit is looking out for the shims under the injector pump as these set the timing.

 

[Sniper]

I refurbished mine as corrosion from the leak had got at it and the mild steel screws that attach it to the block. Took the seals out of the cover and had it bead blasted, filled the pitting with an aluminium epoxy filler then etch primed and powder coated. Bit or Yanmar spray paint and it looked like new. only tricky bit is looking out for the shims under the injector pump as these set the timing.

Thanks for that info. I have wondered about the feasibility of doing this, but I have a morbid fear of separating things which then shoot hidden parts in different directions. From memory the pump sits at the top of the timing cover; is it fairly easy to identify and capture the timing shims once the cover is loose?

 

[Tranona]

is it fairly easy to identify and capture the timing shims once the cover is loose?

The shims sit on top of the casing under the pump. they stick on and look like the aluminium. I found out the hard way by not removing them before blasting but fortunately was able to recover them so I knew how many new ones to put in. So best to remove them when you take the pump out. The official Yanmar manual is worth having if you are doing any serious dismantling.

 

[navrep]

Back to boat today took off cover an gasket again and inspected more closely. From the wear on the cover it looks like it has been put on both ways around - also doesn't look completely flat. Anyhow put it "back to front" as it appeared to me added from gasket grease, tightened the three bolts as evenly as I could and...... no leaks! I also had to bleed the engine but that was another matter!

I am contemplating the speed seal as tricky enough getting that bolt in behind the pulley when comfortably tied up alongside in the marina - wonder if they will be at the London boat show.

Anyhow thanks for all the comments and suggestions - a happy yacht owner again.