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Cummins 8.3 water pump replacement
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Supporting Member of 1/19
Picture of Steve VW
It seems that seals don't last forever. My Monarch is a 98 model but the Spartan chassis was built in 4/95.

Last year a rear axle seal failed. We replaced the seals and rear brakes. This year a front axle seal began leaking. Replaced those seals and brakes. Last summer I replaced the fuel pump because a seal had failed and it was leaking fuel. Last week I had the cooling fan motor replaced because it was leaking at the shaft seal.

The engine had been losing small amounts of coolant for a while. I never saw a leak. In the past I have traced phantom coolant leaks to water pump seals. Sure enough, the last time I ran it the water pump was leaking. Time to change that too.

The Cummins 8.3 water pump is really easy to change. Easy access, you will need only 3/8 drive and 1/2 socket (actually 13mm but 1/2 fits nice and snug) The slowest parts were waiting for the coolant to drain and cleaning the engine block surface!

Remove the belt (just use 3/8 drive in the square hole in the tensioner to relax it and slip the belt off.) Then only 3 bolts.

The back side of the pump and adjacent block surface are fairly corroded. I used a scraper and sandpaper to clean the block, then painted the area. The bolt holes were corroded so I chased them out with a tap. (Metric 8mm x 1.25)

There is an o-ring that seals the pump to the block. Install the o-ring on the pump, then bolt the new pump in place. Remount the belt and you are ready to fill and run. As you can see, the pump part # is 181811.

Have Barth, will travel Tooling Along

"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 300 hp
Posts: 4170 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Supporting Member of 6/19
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That was a very good write up Thumbs Up

Sam is 11 year old Miniature Schnauzer
Currently without a coach

Posts: 240 | Location: Mooringsport,LA | Member Since: 05-30-2019Reply With QuoteReport This Post
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    Forums    Tech Talk    Cummins 8.3 water pump replacement

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