D7 3 T water pump shaft

A good machine shop should be able to turn down the old shaft and get it rechromed. I take it that the seal area is chromed?

A good machine shop should be able to turn down the old shaft and get it rechromed. I take it that the seal area is chromed?

Where have you looked?
Part # 5F9873, fits D7,7M,3T,4T,6T, 8R and 2U1-21192.

Originals where just carbon steel, if chromed it's probably already been reworked.

[quote="Old Magnet"]Where have you looked?
Part # 5F9873, fits D7,7M,3T,4T,6T, 8R and 2U1-21192.

Originals where just carbon steel, if chromed it's probably already been reworked.[/quote]

I have only checked with local cat salvage yard . they have not yet found new one. Not sure but I think it is chromed, no rust anywhere. Thanks for part # . will keep looking. I have friend who is machinist and they use same size stainless shaft for their pumps. would stainless be an option?
Thanks again.

No reason stainless wouldn't work, maybe a 318 or better, 304 is to soft.

I have seen 3T water pump shafts as small as a pencil in the "packing" area still doing the job.

If the problem is on the water side of the pump and the shaft isn't worn way-way down just keep putting packing in (lead rope) and tightening the nut a little every few minutes until the leak stops. With all new packing installed don't try to stop the leak completely all at once with just one adjustment.

[quote="Old 3T lover"]I have seen 3T water pump shafts as small as a pencil in the "packing" area still doing the job.

If the problem is on the water side of the pump and the shaft isn't worn way-way down just keep putting packing in (lead rope) and tightening the nut a little every few minutes until the leak stops. With all new packing installed don't try to stop the leak completely all at once with just one adjustment.[/quote]

Thanks for help. I think I will just put it back together with new packing and oil seal. One more question . Should the packing nut be tightened so there is a drip to cool packing and shaft ? I have read posts here that say let it drip but cat service manual doesnt mention letting it drip....Thanks

[quote="Old 3T lover"]I have seen 3T water pump shafts as small as a pencil in the "packing" area still doing the job.

If the problem is on the water side of the pump and the shaft isn't worn way-way down just keep putting packing in (lead rope) and tightening the nut a little every few minutes until the leak stops. With all new packing installed don't try to stop the leak completely all at once with just one adjustment.[/quote]

Thanks for help. I think I will just put it back together with new packing and oil seal. One more question . Should the packing nut be tightened so there is a drip to cool packing and shaft ? I have read posts here that say let it drip but cat service manual doesnt mention letting it drip....Thanks

I never let mine constantly leak.

With all new packing in the pump, tighten the packing nut by hand as far as you can then crank the engine. With the engine running just turn the packing nut a little bit at a time. If you have the *CAT* water pump wrench, about one pull up of the wrench and then wait a little bit before doing another until you barely stop the leak. Check a few times the first day and then it should last several days of full running before needing adjusting again. Then tighten only enough to stop the leak.