Sunday, September 19, 2021

Replacing the Coolant Hose on Universal M25-xp Diesel Engine

Replacing the Coolant Hose on our Universal M25-xp Diesel Engine

The short hose from the Coolant tank to the Thermostat housing appears to be breaking down near the thermostat housing. At first I  thought it was corrosion of the housing but then realized it's more likely the hose is deteriorating near the hose clamp.

Talking online with buddies on the C34 forum, they confirmed it would be ok to replace the hose with a Silicone hose.

Found one on Amazon and placed the order. It arrived on time and I just needed to spend a bit of time getting the old hose off.

After removing the hose clamps, I used a steel bent point to pull the hose away from the housing and from the coolant tank, only took a few minutes

Cleaned up the housing (Aluminium) and the tank connection (copper) and it was time to replace the hose.

 The new hose has an Elbow, so no need to try and curve it but simply cut the ends to length.

I didn't have any of the non-perforated type of hose clamps handy (not sure where they are right now) So I used the original clamps.

The new hose looks to be a good replacement. We won't be running the engine for at least a week while I complete the Autopilot upgrade project. But I will replace the clamps and then run the engine to ensure there's no leaks.

An easy job. Then it will be time to clean the engine and give it a fresh coat of engine paint.

See you on the water.

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