beco822 Posted February 27, 2018 Share Posted February 27, 2018 This topic has been discussed before and unfortunately I am at a dead end.Have 2 Water pump bolts that keep breaking off I have replaced the Harmonic Balancer and have updated the bolts with the spacers per Mack’s bulletins on this problem.New fan,new Mack water pump,new Mack fan clutch,water pump housing,belt,belt tensioner,alternator.Everything on the front of this motor is new from Mack and I keep having the same issue.Any help would be much appreciated! Quote Link to comment Share on other sites More sharing options...
kscarbel2 Posted February 27, 2018 Share Posted February 27, 2018 I suggest you contact your Mack brand district service representative thru your local Mack brand distributor’s service manager. It’s his job to support you. Quote Link to comment Share on other sites More sharing options...
dogg rescue Posted February 27, 2018 Share Posted February 27, 2018 I had this problem, but it was due to having had a bent fan clutch from a belt hopping off. How often do your bolts break? Quote Link to comment Share on other sites More sharing options...
br549 Posted February 28, 2018 Share Posted February 28, 2018 Is this a E-Tech engine or E-7? Are you using the old pulley on the water pump? If so try a remack w/pump with the pulley already on it. If they are out a few thousand they will break the bolts out at high rpm. This is on an E-Tech engine Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted February 28, 2018 Share Posted February 28, 2018 When I bought my 2001 cl new it was doing that. They put 4 water pumps on and the spacer kits. Still ended up snapping bolts. I finally called enough numbers and got engineering, they asked for my opinion. I told them it should have a plastic fan instead of steel. They sent out a new plastic fan and horton clutch and water pump. Mack installed, never had an issue in a million miles. 1 Quote Link to comment Share on other sites More sharing options...
turckster Posted March 2, 2018 Share Posted March 2, 2018 Here is a service bulletin for CH chassis water pump issues including bolt breakage for the E-7 engine. SB215012-Water pump bracket.pdf Quote Link to comment Share on other sites More sharing options...
beco822 Posted March 8, 2018 Author Share Posted March 8, 2018 On 2/27/2018 at 9:42 PM, br549 said: Is this a E-Tech engine or E-7? Are you using the old pulley on the water pump? If so try a remack w/pump with the pulley already on it. If they are out a few thousand they will break the bolts out at high rpm. This is on an E-Tech engine Yes sir its an E-tech and I have had 3 different waterpumps since this started.But have been taking the pulley off and reusing it each time> Quote Link to comment Share on other sites More sharing options...
beco822 Posted March 8, 2018 Author Share Posted March 8, 2018 On 2/27/2018 at 11:34 PM, Dirtymilkman said: When I bought my 2001 cl new it was doing that. They put 4 water pumps on and the spacer kits. Still ended up snapping bolts. I finally called enough numbers and got engineering, they asked for my opinion. I told them it should have a plastic fan instead of steel. They sent out a new plastic fan and horton clutch and water pump. Mack installed, never had an issue in a million miles. yeah we ditched the 8 blade metal fan and replaced it with a plastic fan and still having the same issue. Quote Link to comment Share on other sites More sharing options...
beco822 Posted March 8, 2018 Author Share Posted March 8, 2018 On 2/27/2018 at 7:51 AM, dogg rescue said: I had this problem, but it was due to having had a bent fan clutch from a belt hopping off. How often do your bolts break? replaced original fan clutch with a Kit Masters and after the fourth time breaking the bolts replaced it with an original Horton and no change.Broken bolts 3 more times after the change. Quote Link to comment Share on other sites More sharing options...
br549 Posted March 8, 2018 Share Posted March 8, 2018 I would try a remack water pump thru mack ordered by the by the truck vin with the pulley already installed. Make sure it has the same type of air fan it came with when it was made I remember some used a real thin spacer between the pulley and air fan, but it might have been a kysor air fan. Give the vin to mack dealer a see how it came from factory. Quote Link to comment Share on other sites More sharing options...
beco822 Posted March 19, 2018 Author Share Posted March 19, 2018 Update.We just installed the ReMack water pump with the pulley already installed,a new set of bolts with the spacers.Fingers crosses! Quote Link to comment Share on other sites More sharing options...
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