usrjcro11 Posted August 30, 2022 Share Posted August 30, 2022 Should the water pump bolts have thread sealant on them. If so what type or brand. First time doing replacement. thanks again in advance Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/ Share on other sites More sharing options...
fjh Posted August 30, 2022 Share Posted August 30, 2022 teflon pipe sealant ! Don't use silicone! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-507976 Share on other sites More sharing options...
Mackpro Posted August 30, 2022 Share Posted August 30, 2022 I always used new factory bolts when installing a water pump on the E7’s . The new bolts come with thread sealant already applied. Back in 2002 Mack sent out a bulletin SB-215-021 to address issues with water pump bolts breaking, stretching and coming loose. This was at the request of UPS due to issues they we’re having with their trucks. I remember talking to the Mack fleet rep for UPS about the bulletin. It involved using 7 longer bolts and spacers for more clamping force and to help with bolt stretch. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-507980 Share on other sites More sharing options...
Mackpro Posted August 30, 2022 Share Posted August 30, 2022 If the link works, type in water pump in the search and all the bulletins will show up for the grey engines. If you type in coolant pump you will get bulletins for the MP engines. Once you choose the bulletin, click print/save file and you can view . https://macktrucks.vg-emedia.com/ProductListing.aspx?GroupId=535 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-507982 Share on other sites More sharing options...
fjh Posted August 30, 2022 Share Posted August 30, 2022 3 minutes ago, Mackpro said: If the link works, type in water pump in the search and all the bulletins will show up for the grey engines. If you type in coolant pump you will get bulletins for the MP engines. Once you choose the bulletin, click print/save file and you can view . https://macktrucks.vg-emedia.com/ProductListing.aspx?GroupId=535 I found it odd that this issue came along ! These bolts never had an issue till they changed to metric stuff! I believe these were fine thread on E6 maybe this was the reason! Can't remember ! Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-507983 Share on other sites More sharing options...
Mackpro Posted August 30, 2022 Share Posted August 30, 2022 3 minutes ago, fjh said: I found it odd that this issue came along ! These bolts never had an issue till they changed to metric stuff! I believe these were fine thread on E6 maybe this was the reason! Can't remember ! Very very possible. We had so many bolts breaking back then I bought a angle drill so I wouldn’t have to pull the water pump housing off . The lower driver side bolt always seem to break when removing if not already broken. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-507986 Share on other sites More sharing options...
Joey Mack Posted August 30, 2022 Share Posted August 30, 2022 I bought the same drill for the same reason.... Too funny. many times with a lefty drill bit, it will catch and screw the bolt out, a regular bit will screw it through and the rag in the hole would catch the bolt.. jojo 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-507990 Share on other sites More sharing options...
mechohaulic Posted August 30, 2022 Share Posted August 30, 2022 I had an extensive set of left -hand drill bits just for that reason. lucked out many times when the left hand drill bit screwed the broken bolt out. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-508000 Share on other sites More sharing options...
Mackpro Posted August 30, 2022 Share Posted August 30, 2022 Around the same time we were having EUP bolts breaking a lot. The angle drill was helpful on thoses too. Of course another service bulletin on updated EUP bolts came out soon after 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-508002 Share on other sites More sharing options...
Popular Post fjh Posted August 30, 2022 Popular Post Share Posted August 30, 2022 (edited) 1 hour ago, Mackpro said: Around the same time we were having EUP bolts breaking a lot. The angle drill was helpful on thoses too. Of course another service bulletin on updated EUP bolts came out soon after Yup funny how things go rash of this and a rash of that! Eup bolts were chronic for a bit ! Must of gone to a dollar store bolt for a bit !Similar to the fuel line fiasco! Dumb ass move on macks part! Fan hub bearings cratering for the first bit on the AI engines ! the berr fan hubs on the AC ! Tried to get by with the lowest bid on stuff ! some times there is a reason to pay a bit more for shit! That said whos to know what's good what's not! till you try it! Edited August 30, 2022 by fjh 3 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-508008 Share on other sites More sharing options...
Joey Mack Posted August 30, 2022 Share Posted August 30, 2022 Come on Guy's.... There are grade 10.9 bolts..... supposed to be better.... 😆 Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-508028 Share on other sites More sharing options...
Popular Post Dirtymilkman Posted August 30, 2022 Popular Post Share Posted August 30, 2022 My 2001 I bought brand new had an air clutch on the fan. That was the first one we ever had snap water pump bolts. And they kept breaking till I finally got ahold of Mack corporate and explained my thoughts. They were still using the big steel fan with the air clutch. When the clutch kicked in, I think it was to much strain. They switched it to a plastic fan and that has over a million miles and no issues. 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-508037 Share on other sites More sharing options...
Vmac3 Posted August 31, 2022 Share Posted August 31, 2022 Wasn't there an update to the fan shroud and water pump that located it lower in the chassis? V 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-508098 Share on other sites More sharing options...
Mackpro Posted August 31, 2022 Share Posted August 31, 2022 13 minutes ago, Vmac3 said: Wasn't there an update to the fan shroud and water pump that located it lower in the chassis? V Yes , when the CX first came out in 2000, the ones with 427 and 460 HP’s were running hot. SB-232-016 bulletin that came out in 2001 showed part numbers and how to install the low mount kit. Only the very first CX’s needed the kit. By October 2000 it was standard on all the CX’s. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-508099 Share on other sites More sharing options...
usrjcro11 Posted September 1, 2022 Author Share Posted September 1, 2022 Thanks to all that replied. Put Teflon dope on them 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70368-1994-mack-ch-350-hp-water-pump-replacement/#findComment-508142 Share on other sites More sharing options...
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