If you wanted an Yanmar 1GM10 rebuilt who would you want to do it?

[Firefly211]

I’m thinking of an engine rebuild on my 1GM10. I know there are lots of places who will rebuild it, but who would you recommend for a high quality job? It can go anywhere in the UK, happy to put it in the boot of the 4x4.

I suppose it’s a question of a rebuild verses a new engine?

 

[LONG_KEELER]

Part Exchange ?

 

[Firefly211]

Part Exchange ?

Sure, that’s not a problem.

 

[mucklestone]

A rebuild can mean anything really from just changing a few seals and gaskets to pretty much building a new engine only retaining the original block. Most 'rebuilds' will be somewhere in between.

You need to get a detailed description of the work that will be carried out, what parts will be replaced etc etc... If you don't you are buying blind.

For most people it will be acceptable to retain most of the original major parts (crank, con rod, pistons, head, valves, camshaft etc) and most won't need the bores re-machining.

 

[Firefly211]

A rebuild can mean anything really from just changing a few seals and gaskets to pretty much building a new engine only retaining the original block. Most 'rebuilds' will be somewhere in between.

You need to get a detailed description of the work that will be carried out, what parts will be replaced etc etc... If you don't you are buying blind.

For most people it will be acceptable to retain most of the original major parts (crank, con rod, pistons, head, valves, camshaft etc) and most won't need the bores re-machining.

Thanks for that. The engine is running but tired. I think i’m looking for the piston rings to be replaced, any crank bearings replaced, the head refurbished ( new valves, springs, etc). But I’d like the water pump, alternator, starter and oil pipes replaced

 

[Firefly211]

I think I’m looking for as near as new as possible. Maybe a new engine is the best route.

 

[KompetentKrew]

I would probably use Simon: SDS Marine Services, Portsmouth

I'm biased though, because I know his parents.

 

[oldmanofthehills]

If you replace rings etc, then some refurbishers will not warantee it. Which for maybe £2k is taking the urine.

On the other hand putting new modern engine in can cost £6k.

You have a boat and as Clancy said its all f**d up

 

[jwfrary]

Prior to going down the rebuild route.

Your replacment of ancillaries requirement is going to add significant cost to the project to get to an as new unit which I assume is what your aiming for. A quality job costs and if your looking a using genuine parts you won't be far off the cost of a brand new one.

Even as a long time yanmar user, I would cost a beta 10 as a replacement. your gearbox is probobly also long in the tooth anyway you will need to consider that in the rebuild.

Modern engines like the beta are more responsive, multi cylinder, cleaner and quieter than the GM. And beta can supply it with mounts to suit your existing GM ones.

As a plus the alternator will be bigger, you will have fresh water cooling and economy improved.

Food for thought!

Ps. If it was mine I would rebuild myself on the kitchen table

 

[Greemble]

Ps. If it was mine I would rebuild myself on the kitchen table

Likewise.
It's a good way to get to know your engine.

 

[Firefly211]

Prior to going down the rebuild route.

Your replacment of ancillaries requirement is going to add significant cost to the project to get to an as new unit which I assume is what your aiming for. A quality job costs and if your looking a using genuine parts you won't be far off the cost of a brand new one.

Even as a long time yanmar user, I would cost a beta 10 as a replacement. your gearbox is probobly also long in the tooth anyway you will need to consider that in the rebuild.

Modern engines like the beta are more responsive, multi cylinder, cleaner and quieter than the GM. And beta can supply it with mounts to suit your existing GM ones.

As a plus the alternator will be bigger, you will have fresh water cooling and economy improved.

Food for thought!

Ps. If it was mine I would rebuild myself on the kitchen table

As you said, food for thought. thanks

 

[Firefly211]

Likewise.
It's a good way to get to know your engine.

in principal I completely agree. In reality, with one bedroom taken up with sails, spinnaker pole, various cushions, and bits for future projects I’m not going to suggest taking over the kitchen table given that the tumble dryer is already blocked by my cross trainer / clothes horse!

 

[jwfrary]

in principal I completely agree. In reality, with one bedroom taken up with sails, spinnaker pole, various cushions, and bits for future projects I’m not going to suggest taking over the kitchen table given that the tumble dryer is already blocked by my cross trainer / clothes horse!

I do recall when an uni some time ago.... there was regularly something in the kitchen that didn't belong, dishwashers are pretty good parts cleaners on a budget.

Food did taste a little interesting on occasion!

 

[Firefly211]

And halyards come up well when hidden inside pillow cases.

 

[Tranona]

Cellar Marine in Cornwall cornwallmarine.net/member-listings/listing/cellar-marine-ltd is the go to place for older style Yanmar engines. however as already suggested consider replacing with a Nanni or Beta 10 or 14. Almost direct swap - sllghtly different mount spacings and exhaust on the other side with a smaller bore but Beta do an adaptor. I have done it and it was very straightforward. The difference is well worth having. You should be able to get a good price for your 1GM as even well worn ones are attractive as they are easy DIY refurbed (but not usually commercially viable)

 

[jamie N]

New rings are cheap. Having a head refurbished by the same place which would do your injector, is cheap and professional. If one wanted a new alternator, even a new water pump, it's still only going to be a few hundred pounds and off the shelf, and is the way that I did my own engine.
A lot depends on your ability and desire to do it, which is unusual at this time of the year.
Whilst the head is away being done, you're doing the rings and cleaning the waterways in the block. Once these are done, it's refurbished.

 

[Blueboatman]

New rings are cheap. Having a head refurbished by the same place which would do your injector, is cheap and professional. If one wanted a new alternator, even a new water pump, it's still only going to be a few hundred pounds and off the shelf, and is the way that I did my own engine.
A lot depends on your ability and desire to do it, which is unusual at this time of the year.
Whilst the head is away being done, you're doing the rings and cleaning the waterways in the block. Once these are done, it's refurbished.

My thoughts too
Take the head off yourself , take it to someone for a injector /valve job, check the exhaust elbow(!) . And budget for a new Beta .

 

[jwfrary]

With regard to rebuilding, you won't really know what needs to be replaced untill everything has been measured.

Here's a rough run down from the top of my head for yanmar prices,

Piston 100
Rings 40
Gudgon pin and c lips 60
Overhaul gasket set 80 (not genuine)
Head machining operations approx 300
Valves, stem seals springs 70
Big end and crank bearings 300
Crank polishing and block machining (more of out of round) 300.
Injector cleaning and pump Overhaul 200-500

Approx 2000 labour.

Then you have the servicing items to add on top, thermostat, exhaust elbow, starter alternator, hoses, waterpunp. 600 quid ish more if you go OEM.

Engine mounts yanmar ones are pretty pricy! 300 a go!

To do it 'properly' and not DIY you could be easily spending circa 4-5 k without paying someone to take it out and put it in! and even at that you won't have a truly zero hour rebuild, I doubt that's very far from a new beta though I'm a bit out of touch with pricing with small engines. And you will likely recoup the cost of install by selling the old one!

 

[Stemar]

Prior to going down the rebuild route.

Your replacment of ancillaries requirement is going to add significant cost to the project to get to an as new unit which I assume is what your aiming for. A quality job costs and if your looking a using genuine parts you won't be far off the cost of a brand new one.

Even as a long time yanmar user, I would cost a beta 10 as a replacement. your gearbox is probobly also long in the tooth anyway you will need to consider that in the rebuild.

Modern engines like the beta are more responsive, multi cylinder, cleaner and quieter than the GM. And beta can supply it with mounts to suit your existing GM ones.

As a plus the alternator will be bigger, you will have fresh water cooling and economy improved.

Food for thought!

Ps. If it was mine I would rebuild myself on the kitchen table

I assume you've lived with 10HP for a while, but have you ever wished for a bit more umph? If you go down this route, it must be worth thinking about whether a few more horses would be a good investment. At least, if you think now, you won't wish you had when you're trying to punch a tide. The extra weight for the Beta14 and 16 is insignificant compared with the 10. Extra price, though? Maybe not so insignificant.

For me, I think it would come down to a choice between the Beta and the kitchen table. The budget would probably be the deciding factor.

 

[Tranona]

I assume you've lived with 10HP for a while, but have you ever wished for a bit more umph? If you go down this route, it must be worth thinking about whether a few more horses would be a good investment. At least, if you think now, you won't wish you had when you're trying to punch a tide. The extra weight for the Beta14 and 16 is insignificant compared with the 10. Extra price, though? Maybe not so insignificant.

For me, I think it would come down to a choice between the Beta and the kitchen table. The budget would probably be the deciding factor.

Actually the Beta 14 is identical to the 10 except it is governed to 3600 instead of 3000rpm, plus a few minor differences such as better control panel and engine oil pumpout. The 16 is a physically bigger engine, longer and a bit heavier.