86 M1009 Water Pump

2INSANE

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Then the icing on the cake would be a rare dampened V-Belt Crank Pulley to make that motor run as smooth as my wife’s homemade whipped cream.
 

Keith_J

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If you have the timing chain cover off, check the chain slack. All diesels are interference engines which could be damaging to at least the push rods. Not that timing chains fail, wear in the set will let you know when to change.
 

Jmccarty25

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Lakeland, FL
I've seen and replaced failed dampers. The level to which you're going to tear it down, you'd be better off replacing it if there's any doubt. Also replace the front main seal if you replace the damper. Check timing chain for stretch while it's apart as well. (Doubt it's a issue, but you're there, only take another minute to check) And I'd advise new belts and hoses while you're in there. Again, to the level you're going to tear it down, it only make sense.
Definitely will do all of those things. I would much rather replace items while the engine is tore down. Thanks
 

Jmccarty25

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Lakeland, FL
For a few dollars more, you could easily upgrade to a higher flow Flowkooler water pump. Just give them a call and tell them what you need.


Here’s a good write up on replacing the timing cover, water pump etc I did not long ago. Starts on page 5 close to the bottom. Might help you out with getting a super clean install. It it crucial to have the threads super clean and to apply a generous amount of RTV on the bolt ends. Especially on the 2 water jacket holes on driver side of the timing cover and 2 smaller holes below the harmonic balancer.

Ill be calling thm for sure. Ill update y'all on what I find out.
 

Jmccarty25

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Just an update.....Ordered a water pump from Flowkooler on 12/07/21 and have yet to receive it. Customer service is blaming the supply chain issues. I believe them but decided to go a different route and ordered an ACdelco pump off Rockauto.com. I also ordered many of the other parts recommended in the thread including a harmonic balancer, hoses, belts etc.. All the parts, including 2 years worth PM materials for all my vehicles arrived in a few days. I am beginning the tear down tomorrow.
 

2INSANE

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Belgrade, Montana
Just an update.....Ordered a water pump from Flowkooler on 12/07/21 and have yet to receive it. Customer service is blaming the supply chain issues. I believe them but decided to go a different route and ordered an ACdelco pump off Rockauto.com. I also ordered many of the other parts recommended in the thread including a harmonic balancer, hoses, belts etc.. All the parts, including 2 years worth PM materials for all my vehicles arrived in a few days. I am beginning the tear down tomorrow.
That sucks you could not get a flowkooler water pump. I remember last winter when I was building 6 motors, flowkooler said they only had 2 left in stock. With this crappy economy from COVID, it does not surprise me that they are short handed with the manufacturing.

The other alternative could be a 6.5 serpentine belt set up with a high flow 130gpm counter clockwise rotation water pump with a dual thermostat coolant cross over. Cheap upgrade if you can find a junk yard donor.
 

79Vette

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I have the Rockauto pump and a Rockauto aluminum radiator in my M1009. It provides plenty of cooling.

I have installed 3.73 axle gears and a manual trans, but hauling a 6000 lb trailer up into the mountains the coolant never got over 190F. Oil temp never got above 210. Foot on the floor in second gear for 10 min climbing the pass, AC blasting on full, and it didn't seem to care a bit.
 

MarcusOReallyus

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Virginia
High flow water pumps often do not cool as well. More is not always better.

A balanced design is what cools well, not just "whatever''s the biggest!!!".
 
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