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Topic: 8.3 Mechanical WATER PUMP (Read 642 times) previous topic - next topic

8.3 Mechanical WATER PUMP

Just throwing this out there,talked to Larry about the coach he has for sale,he told me the water pump had been changed and
that the impeller on the old one was worn to a point that in comparing new and old you could tell the difference.Think is was
somewhere around 150k miles.Since I am able to change the pump myself I'm thinking of changing out the pump as our coach
has 230k and looks like the original pump,it's not running hot.Anyone else have this expierience?
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: 8.3 Mechanical WATER PUMP

Reply #1 –
If you have the facilities to conveniently do the swap, and the timing is good for you, why not change it?  I like preventative maintenance.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: 8.3 Mechanical WATER PUMP

Reply #2 –
Old is old and high mileage means high usage. I vote for preventive maintenance. ^.^d
Nitehawk,  Demolition Lady, & our NEW master, Zippy the speeding BB cat.
1989 Grand Villa 36' ORED
Oshkosh chassis, 8.2 DD V8
2006 Saturn Vue AWD

Re: 8.3 Mechanical WATER PUMP

Reply #3 –
I would probably wait until time for the next coolant/thermostat change/replacement.

Said another way, do it along with a complete cooling system PM. Timing up to you.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: 8.3 Mechanical WATER PUMP

Reply #4 –
When changing that waterpump be sure and recheck and retighten the bolt that secures the alternator bracket.  It tends to loosen and wallow out the pump casting.
Gary B

Re: 8.3 Mechanical WATER PUMP

Reply #5 –
On the original pump casting, it will say made in england.  Yes, as preventive measure I would replace it along with coolent, thermostat, belts and tentioners.  That said, you asked for my experience, you might check out a previous post of mine on this.  I replaced mine as preventative maintance right before a 2,500 mile trip with a NAPA water pump, a month later, 2,500 miles, it leaked.  This time I went back and got a "Cummins" pump from Cummins.  A year later now, it is leaking also out the weep hole.  Most likely this time I will go back to NAPA, as I may be slightly over 1 year and 500 miles on the latest one.  This will be of course after I talk to Cummins if they choose not to replace mine from 1 yr ago.
97 U295 40, Build #5040, 6C8.3 325 HP
Oregon Continuous Traveler
Samsung Residential #RF20HFENBSR,
Xantrex SW2012, (3)AGM8D Hse, (2)AGM Grp24 Eng, Victron BMV-712, 1800w Solar 4 LG & 2 Sunpower
Extreme Full Body Pt w/hdlmps, new furn/floor, 4 down Lexus 2004 GX470 AWD curb weight 4,740 lbs
Prev: 1990 Barth, 10L 300 2 yrs; 91&92 Monaco Signature, 10 yrs, 10L C 300 &  6C8.3 300; 1997 ForeT 6C8.3 325 since May 2017.  Employed by Guaranty RV 14+ yrs.  Former VW New Car Dlr/Service Dlr, Sales Mgr, Rv Sales, and Service Adviser from 1968-2017
"Don't criticize what you can't understand" Bob Dylan

Re: 8.3 Mechanical WATER PUMP

Reply #6 –
Replaced mine a couple months ago just do to age. Easiest water pump change out that I have ever done. (Thanks CM Fore for the easy access)

I used this one from US Motor Works.  Looked exactly like the OEM

US740H by US MOTOR WORKS - WATER PUMP
Justin & Cathy Byrd
1995 U280 "Old Faithful"
36' Build #4673
C8.3 Cummins
Allison MD3060R 6 speed - retarder
Powertech 10KW  4cyl Kubota