Re-powering an Inboard diesel TH

[RodM]

I've decided to make a long term boat of Pelagian, and part of this decision was repowering... Replacing the aged and corroded Volvo MD5A with something newer. The OBM bolted on the stern was only ever a temporary fix:). After doing a job on the head of the Volvo and finding there's still water getting to the sump, it was time to think big(ger). Or at least newer.

I've picked up a good second hand Yanmar 1GM10. I'm likely to replace the prop tube and shaft/prop, and will get professional opinion re prop requirements, possibly even sail it to a good mob for fitting. However, I'd appreciate any comments from people who have swapped over an inboard on a TH. This isn't a next week job, it'll likely be a few months before I make the swap.

And in time, I'm looking forward to advertising a long shaft Honda four stroke 5hp with clean prop and only a few hours work:) Then it'll be the cabin ports, and the rigging, and the...

Cheers, RodM

[KJD13]

Good choice Rod, I am sure you won't regret the decision. The Yanmar is a great little engine - I have one on my Mark 111, the Wayward lady". One of the great benefits is that it uses half a litre of diesel per hour!
Cheers,
Kevin
Wayward Lady
Williamstown,Vic

[Deepsouth42]

hi
I rebirthed my 1GM10.
Replaced head, new mixing elbow(made of stainless steel-off ebay-better than the standard one)
new alternator
overhauled starter
new water pump bearings and impeller
new anodes
plus carefully removed the accumulated lime from water jacket
replaced sureseal as well.

all going fine a18 months down the track

what I wish I knew then that I know now...

remove and install the short engine only-nothing else (starter/alternator/air cleaner all off)
Yes it is a pain to fiddle around fitting them in-situ but the ease of getting the engine into exactly the right spot and having it lined up correctly is worth it.

fit a drain hose with a tap onto the little stopcock so you can drain the salt water out of the engine after each use-and flush annually with CLR solution.

Disconnect the exhaust after every use to ensure that the puddle of salt water in the anti siphon does not get onto the exhaust valve-and wreck the mixing elbow.

I also painted the engine bay white to maximise the available light in that gloomy space.

I put some stages on youtube;
http://www.youtube.com/watch?v=jqfKhcQsbWA

good luck

PS and the whole exhaust hose needs going over-new stainless hose clamps at least.

tom