|
700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
Information |
|
Loss of coolant and head gaskets ......Views : 2480 Replies : 41Users Viewing This Thread : |
|
Thread Tools | Display Modes |
May 19th, 2018, 17:23 | #21 |
bob12
Last Online: Today 13:20
Join Date: Aug 2006
Location: Woking
|
|
May 19th, 2018, 20:27 | #22 |
Premier Member
Last Online: Apr 15th, 2024 09:22
Join Date: May 2012
Location: Lakenheath
|
That's the one i was thinking of then, fairly certain it's a LHD diagram.
Most of it is the same on RHD except for the heater hoses, they have to come round the back of the engine to the heater matrix. The lower heater matrix hose joins up with the metal pipe that runs under the exhaust manifold to the water pump at the front and at the back, round the back of the head and appears somewhere near the rear end of the inlet manifold. The higher heater matrix hose (that goes through the valve in the cabin) joins either the cylinder or inlet manifold where the coolant comes out of that part. Still can't remember enough to do a sketch but hopefully between that description and the heiroglyphics in Haynes, you'll be able to put 2 and 2 together. I may have that description a bit wrong, been several years since i saw a B2x0 in the metal but i'm sure if i have, someone will correct me!
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
May 21st, 2018, 19:30 | #23 |
bob12
Last Online: Today 13:20
Join Date: Aug 2006
Location: Woking
|
Seems from observation that it doesn't 'leak' coolant until/as it cools down and, due to engine undertray, I can't fcuking see where it's coming from except for a blue water drip from the rear central hole on the on the undertray.
Spoke and delivered said car to Joe at the garage this morning to be fixed!!!! I could to it perfectly but why waste my time. Now driving around (it would seem on air!!) in a small metallic green Cleo auto. Typically French (never French again for me after my Peugeot 505 Family Estate of the 1980's). The fuel gauge on the Cleo when 'off' rests a max and then when 'on' moves down to the (correct??) tank level. |
May 21st, 2018, 20:53 | #24 |
Premier Member
Last Online: Apr 15th, 2024 09:22
Join Date: May 2012
Location: Lakenheath
|
Sounds suspiciously like the water pump Bob - fine when it's running but the seals are weak and letting by when it cools down and leaking out of the tell-tale hole in the nose of it.
Won't leak while running because it will be pulling air in. Just my theory based on what you've said so far or it may be a pipe on the suction side of the pump e.g. heater return to pump via that metal pipe that runs under the exhaust manifold.
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
The Following User Says Thank You to Laird Scooby For This Useful Post: |
May 21st, 2018, 22:05 | #25 |
bob12
Last Online: Today 13:20
Join Date: Aug 2006
Location: Woking
|
Well Dave ... I like that comment A LOT as it fits in with my thoughts. No problem with the the heater return pipe.
I had suspected the new pump front seal might have gone bad (after only 450 miles!) as when cooled a very little of the blue coolant was lying on the visible fin of the pump structure and clearly not (?) from the top 'O' ring top seal (or elsewhere from the heater pipe return seal). As said the blue coolant on the fins of the structure of the pump body to my mind could have only got there from a 'front' leakage, but without removing the fan you can't see under the fan hub. We await a new dawn tomorrow. |
The Following User Says Thank You to bob12 For This Useful Post: |
May 21st, 2018, 23:09 | #26 |
Premier Member
Last Online: Apr 15th, 2024 09:22
Join Date: May 2012
Location: Lakenheath
|
Will be interesting to see the outcome Bob!
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
The Following User Says Thank You to Laird Scooby For This Useful Post: |
May 28th, 2018, 20:28 | #27 |
bob12
Last Online: Today 13:20
Join Date: Aug 2006
Location: Woking
|
Dave, you might have surmised from another post of mine today that the loss of coolant problem on the 745 was easily solved
Nothing as sophisticated as the new pump seals relaxing on engine cool down, but the usual 'Redblock' problem of the top pump 'O' ring weeping and dripping behind the cambelt cover where you couldn't see it easily. It then tricked down the block under cover of the cambelt cover until it dripped onto the engine under-tray where it puddled and dripped on to the ground via the hole at the back end of the tray! Anyway Joe took the lot to bits again and after some new gaskets it's just fine (at the moment!) ... and at no cost (Joe muttering silly design as I drove off). |
The Following 3 Users Say Thank You to bob12 For This Useful Post: |
May 28th, 2018, 22:43 | #28 |
Premier Member
Last Online: Oct 26th, 2023 20:42
Join Date: Jun 2010
Location: Thurrock
|
I'm glad you have found and fixed the leak.
For detecting obscure obdurant leaks like this, has anyone tried UV dye in the coolant? My Draper hand held COB LED work light has a UV option for that purpose. I shall probably buy some of the dye in case I need it. Off Topic: It's an excellent work light. Even fixes by magnets to the trolley jacks as they go under the jam jar. I keep it handy in case I might need for example to fix it by magnet to a wing over any wheel that needs changing. But I guess most LED work lights do that sort of thing. . . |
The Following User Says Thank You to Stephen Edwin For This Useful Post: |
May 28th, 2018, 23:28 | #29 |
Premier Member
Last Online: Apr 15th, 2024 09:22
Join Date: May 2012
Location: Lakenheath
|
I wondered about that "O" ring Bob but misunderstood another post earlier in the thread so i thoght it had been checked and/or replaced so said nowt.
Glad it's sorted now anyway!
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
May 28th, 2018, 23:34 | #30 | |
Premier Member
Last Online: Apr 15th, 2024 09:22
Join Date: May 2012
Location: Lakenheath
|
Quote:
When the battery went, i upgraded it to a 20Ah (largest i could squeeze in), renewed the croc clips on the end of the jump leads and confined the torch style lens to the bin, replacing it with a 12v 10W LED floodlight from China-bay for something like £3 delivered. That gives an amazing amount of bright, white light.
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
|
The Following User Says Thank You to Laird Scooby For This Useful Post: |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Display Modes | |
|
|