Yanmar 4JH2-TE complete rebuild - next steps?

[Sulaire]

Hi leighwebber,

Great job.

I have the same engine and completed a rebuild a few years back, like you i had the engine taken go a machine shop to re bore etc.

Without going into too much detail the shop managed to crack the fuel injection pump across the face where it bolts onto the block!.,! I did not realise this until tracing a new oil leak took months to find this fault....

I have been looking for a replacement fuel injection pump for this engine everywhere as yanmar do not make them any more!... oil leak is manageable but annoying.

My FI pump model number is 729571-51300 would you be able to confirm yours is the same and if you came across any units during your rebuild?

Thanks in advance, and here is a pic of my damaged FI showing crack, it goes right through and across the face as I mentioned.

[jhulmer]

Originally Posted by Sulaire

Hi leighwebber,

Great job.

I have the same engine and completed a rebuild a few years back, like you i had the engine taken go a machine shop to re bore etc.

Without going into too much detail the shop managed to crack the fuel injection pump across the face where it bolts onto the block!.,! I did not realise this until tracing a new oil leak took months to find this fault....

I have been looking for a replacement fuel injection pump for this engine everywhere as yanmar do not make them any more!... oil leak is manageable but annoying.

My FI pump model number is 729571-51300 would you be able to confirm yours is the same and if you came across any units during your rebuild?

Thanks in advance, and here is a pic of my damaged FI showing crack, it goes right through and across the face as I mentioned.

Attachment 225522

for what it's worth - I have used Devcon metal repair epoxies to repair items like you pump housing with good historical results. Not permanent solution but it will last a long time until you can find a replacement.


This aluminum putty, I have used to repair aluminum castings, housings, pump housings with good results.


https://www.mcmaster.com/74575A72/

[Capt Pete]

Hi
I am about to replace the cracked flywheel cover on my 4jh2 engine
I plan to do this in the boat.
The two rear mounts are attached to this cover will I need to remove the oil pan to remove the gear box plate as I had planed to support the engine on the pan.
Any pointers you could give me would be appreciated

Thanks Pete