Thread: water pump replacement on 4bd1

Iron pump. Can be rebuilt. Go to an Isuzu truck or industrial engine dealer for a repair kit. Or go to a truck wrecker for a used pump ex an N series Isuzu or a Ford Trader.

its a doddle, tho depending on the internal corrosion on the shaft/impeller seperating it without a press and suitable drifts might rise a few 4 letter word combos..

If you cant do it and dont need the gear send it up my way and I'll knock it over here..

Its a 4bdI pump and I can claim a work competancy on it.

thanks Brian and Dave for the replies.

I took a serious look at it this morning. There was a small slit in the hose between the thermo housing and water pump. I replaced it this morning and it seems to have fixed the problem. I did notice there was corroded bits/grains inside the old hose. Is this a sign of a problem. The motor was sitting for about 4 years without a radiator or coolant.

Also, i noticed a grease nipple on the waterpump. I tried greasing it but my gun is stuffed (do you grease guns Brian?). How often should this be greased.

thanks again.

Peter

No, don't sell grease guns unless I acquire one in a mixed auction lot. Have a Macnaught minilube for my own use and until I acquired the County-Isuzu, it had not been used for years, modern cars dont have grease fittings. I looked in both Isuzu workshop manuals that I have, the automotive one and the industrial one, and neither mention using the grease fitting although it is shown in exploded views. The books say to repack with multi-purpose grease on re-assembly. If it hasn't been apart or greased for a good while, then I suppose a couple of pumps wouldn't hurt, but dont overgrease as excess might find its way into the coolant and start blocking tubes.

thanks for the reply Brian. I have a Mcnaught. Bought it new and hardly used. No resistence when pumping and no grease. The gun has a cylinder cartridge that is probably half full (the length of my finger anyway). Maybe I am doing something wrong.

Is it the one that clamps on top of a 5kg tin of grease with a spring loaded rod and piston that pressurises a hose and gun assembly? If so, you can get a repair kit which is really bugger all, just a couple of springs, balls, & o-rings which fit comfortably in a half of a pay envelope & for which you have the privilege of parting with about $20. Even a pom could fit.

Hi Guy's,

If your going to get a genuine water pump repair kit, please be aware unless things have changed since I did ISUZU parts, that their water pump kits do not contain the bearings. You have to buy them separately.

Originally Posted by rar110

thanks for the reply Brian. I have a Mcnaught. Bought it new and hardly used. No resistence when pumping and no grease. The gun has a cylinder cartridge that is probably half full (the length of my finger anyway). Maybe I am doing something wrong.

If its the one hand operated canister gun you need to bleed it once a new canister is fitted. Does it have a bleed nipple on the top. Its a spring loaded ball in a stem. You pull out the primer shaft and turn till it stays out. Then push on it while pushing the spring loaded ball in. You should get a heap of air then grease.

Justin