Help I'm stuck ! What size torx are the water pump bolts ?

patrolman pete · 29th August 2021, 12:37

Further to my post about my leaking water pump. I've stripped away the engine mounting to get to the pump and assumed the bolts would be standard bolts but they appear to be torx bolts and I haven't the tool to fit. Anyone done this job that can advise please

trikey · 29th August 2021, 14:38

I can’t remember the size Pete, but a metric socket fits well enough, I’ve always removed and replaced the bolts without using the torx socket.

patrolman pete · 29th August 2021, 15:09

Hi Andy, I’ve managed to get the thermostat out using a 1/4 inch socket over the protruding splines of the four small bolts. The water pump appears to be held in with T30 bolts needing a spline tool not 10 or 11 mm bolts which I assumed they would be . I haven’t started removing them yet in case these are not to water pump bolts ! I’ve taken the belt off and there is loads of side to side play in the pump pulley so that confirms the fault. My other worry is that the coolant is dirty and black but not oily or emulsified so I hope this just from the collapsed bearings as the engine never overheated or lost much coolant !

patrolman pete · 30th August 2021, 13:08

Well it's out and what a fiddle it was ! They are torx bolts holding it in and not 10 mm as Haynes shows ! There are a couple of similar bolts around the area which had me worried I would remove the wrong bolts. Just waiting for my replacement from DMGRS. I'm going to have to replace the top hose as I have the aluminium thermostat fitted so hopefully I can find one in the local scrapyard to tide me over as I need the car ready to go by Thursday.

29th August 2021, 12:37	#1
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,418 Thanks: 618 Thanked 333 Times in 197 Posts	Help I'm stuck ! What size torx are the water pump bolts ? Further to my post about my leaking water pump. I've stripped away the engine mounting to get to the pump and assumed the bolts would be standard bolts but they appear to be torx bolts and I haven't the tool to fit. Anyone done this job that can advise please

29th August 2021, 14:38	#2
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,764 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	I can’t remember the size Pete, but a metric socket fits well enough, I’ve always removed and replaced the bolts without using the torx socket. __________________ Lest we forget..

29th August 2021, 15:09	#3
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,418 Thanks: 618 Thanked 333 Times in 197 Posts	Hi Andy, I’ve managed to get the thermostat out using a 1/4 inch socket over the protruding splines of the four small bolts. The water pump appears to be held in with T30 bolts needing a spline tool not 10 or 11 mm bolts which I assumed they would be . I haven’t started removing them yet in case these are not to water pump bolts ! I’ve taken the belt off and there is loads of side to side play in the pump pulley so that confirms the fault. My other worry is that the coolant is dirty and black but not oily or emulsified so I hope this just from the collapsed bearings as the engine never overheated or lost much coolant ! Last edited by patrolman pete; 29th August 2021 at 15:15.. Reason: More info

30th August 2021, 13:08	#4
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,418 Thanks: 618 Thanked 333 Times in 197 Posts	Well it's out and what a fiddle it was ! They are torx bolts holding it in and not 10 mm as Haynes shows ! There are a couple of similar bolts around the area which had me worried I would remove the wrong bolts. Just waiting for my replacement from DMGRS. I'm going to have to replace the top hose as I have the aluminium thermostat fitted so hopefully I can find one in the local scrapyard to tide me over as I need the car ready to go by Thursday.