This just happened, oh bugger !!

[Bazza954]

Great start, 2 days in to a nice long cruise an this happened this morning

 

 

[magnetman]

Bloody hell! Plank in the prop??

[Bazza954]

No plank, cruised yesterday no probs, started up this morning, strange noise, stopped engine had a look and found that !!

[magnetman]

It happened in Neutral?

 

Must have been cracked for a while and just suddenly failed.

[b0atman]

Will RCR cover it

[Bazza954]

Engine has done 178 hours, not in RCR, but

I'm getting a new one supplied by engine people on Thursday. FOC.

In the meantime, beer and ice cream in the Yorkshire sunshine

Edited July 22, 2014 by Bazza954

[magnetman]

What engine is it ?

Are they replacing whole lot?

[Bazza954]

Its an ISUZU the whole engine mounting is being replaced with a new one.

[magnetman]

Have you looked at the others? I would ask for all 4 to be done in case it was a dodgy batch.

 

If possible.

[nb Innisfree]

Make sure the engine is correctly aligned and balanced on the mountings.

[magnetman]

I'm impressed the way it has just snapped

 

Could bad alignment do that? On rubber mounts?

 

The mount seems to have lifted, it really looks like something got wedged in the prop..

 

I suppose another possibility is that the engine was dropped before or during installation. I just can't see that thing shearing off like that without serious impact, or very low quality materials, or very old engine/loose mounts.

[Machpoint005]

Looks like a fatigue fracture from what I can see. Lots of reciprocating energy slowly weakening the point of maximum deflection, microcracks start to grow until until what is left can't take the stress, then bang.

[nb Innisfree]

If engine weightisn't evenly distributed on all four mounts then oneor more mount will be under stress. I could imagine that taking its toll over time.

[Proper Job]

Bolt 'em straight to the base plate.

 

No problems with engine mountings then

 

................ but it does play havoc with your fillings

[magnetman]

Very low hours on this engine apparently.

 

 

drilling 12mm holes through the baseplate? ?

I think its a badly cast (?) engine mount which has just failed

[nb Innisfree]

In any case the engine needs balancing on its mounts.

 

This is my method:

 

Disconnect g/box output flange from propshaft.

 

Slacken rear stern mounts until weight of rear of engine/gearbox is resting on a scissor jack placed under g/box output flange

 

Adjust forward pair of mounts until front of engine is sitting equal height from bearers.

 

Waggle engine/gearbox to enable it to settle at its centre of gravity.

 

Adjust rear mounts until they are both touching touching engine brackets evenly.

 

Remove jack.

 

Then align gearbox flange by adjusting mounts in pairs, front ones by equal amount and same for rear. Don't adjust any left to right mounts differntly from each other.

[Machpoint005]

Great start, 2 days in to a nice long cruise an this happened this morning

 

Commiserations, but it wasn't very likely to happen when you weren't cruising, now was it?

 

 

 

edited cos my laptop can't speel

Edited July 22, 2014 by Machpoint005

[Genn]

It is a fractured weld isn't it? certainly looks that way if you look to the back there is a weld bead, and also along the top, admittedly it looks bad because there is no evidence of champhering for the bead.

 

Glenn

[magnetman]

I thought it was cast iron but not really sure on that

Looking at it carefully now I'm on the laptop not the phone it looks like it was broken at some point and welded up again, followed by a failure of the weld.

 

 

I'm sure it was a broken mount, cast, which has been welded up to repair it. there seems to be a supporting web which has also broken.

and a weld around to the right of the flexible mounting bolt.

 

cast iron mount which has shattered and been bodged back together i reckon.

Edited July 22, 2014 by magnetman

[Genn]

I thought it was cast iron but not really sure on that

Looking at it carefully now I'm on the laptop not the phone it looks like it was broken at some point and welded up again, followed by a failure of the weld.

 

 

I'm sure it was a broken mount, cast, which has been welded up to repair it. there seems to be a supporting web which has also broken.

and a weld around to the right of the flexible mounting bolt.

 

cast iron mount which has shattered and been bodged back together i reckon.

Which is probably why a no quible replacement .

 

Glenn

[MtB]

Given the severe dislocation of the two parts of the foot after the fracture, I'd say the foot casting was under considerable stress prior to breaking.

 

In fact I'm not surprised it broke, being aluminium.

 

 

MtB

[Boat&Bikes]

Looks like a broken casting to me .

 

Ian

[MtB]

Looks like a broken casting to me .

 

Ian

 

[Emerald Fox]

The guys on 'Car Talk', an American radio show said that Isuzu vehicles were the mainstay of their car repair business/workshop, that's how they made most of their money - because are Isuzus known for breaking down. Made in China, perhaps?

[Boat&Bikes]

The guys on 'Car Talk', an American radio show said that Isuzu vehicles were the mainstay of their car repair business/workshop, that's how they made most of their money - because are Isuzus known for breaking down. Made in China, perhaps?

I saw a big lorry today loaded with parts ready to bolt on to the cars being made under the badge of Aston martin and Jaguar. How bad are these cars?