To ensure the engine was as reliable as possible, we replaced various components, gaskets and seals.

In theory, none of these upgraded the engine in anyway, but by replacing potentially 30-years old ones we could be more confident in the reliability of the engine in general.

Water Pump
Water Pump
We replaced the water pump (which pumps coolant around the engine) with a new Cummins 3285410 Water Pump. Importantly this is not the standard one (on the right), but a heavy duty one (on the left) that has the shroud covering the turbines. It's not clear from discussions on The…
Oil Pump
Oil Pump
With the engine cover removed we decided to replace the oil pump whilst it was a trivial job. For this we used a Cummins 3930337 Oil Pump. We'll keep the existing one as a spare.
Flywheel
Flywheel
Whilst cleaning the engine, ready for painting, I got a little concerned about the amount of rust on the flywheel. After removing it, I noticed some pretty extensive heat cracks, but thought they could be removed by having it resurfaced. So, I took it to Seattle Brake and Clutch, who…
Coolant Thermostat
Coolant Thermostat
Having dismantled the coolant intake, it was obvious we needed to replace the gasket and o-ring, so decided to buy a complete kit that included the Thermostat (Cummins part 3802273).
Radiator and Heater Core
Radiator and Heater Core
A radiator works by flowing the coolant through 100s of small fins that have a massive surface area, allowing air to lower the temperature. Unfortunately, this also allows a huge amount of sand to get stuck, as illustrated by the photo above. After rinsing out all the sand it was…
Clutch
Clutch
A clutch is a consumable and something that needs replacing at a regular interval. We decided to replace during the rebuild because we had the engine out and it was an easy install. After getting quotes in the US, we found the UK company ClutchFix had the best price, even…