The life and times of a bowman heat exchanger
Mar 27, 2019 22:24:34 GMT
thebfg, bargemast, and 2 more like this
Post by Deleted on Mar 27, 2019 22:24:34 GMT
As promised (and a welcome diversion from the LGBT nonsense!)
Here is a crusty FH200 Bowman indirectly cooled heat exchanger - antifreeze whizzes around the engine; sea or river water takes the heat away -a properly sized and installed system is vastly superior to a keel cooled arrangement (until the intake blocks up....) as the cooling medium is as good as inexhaustible - itβs capable of cooling a 120 HP engine - same set up as the 67HP EH220 fitted to the BMC 1500 turbo (I donβt plan on using the FH but it needed sorting and relocating from work.....!)
The biggest failings are flakey impellers and tired heat exchangers ( referred to as HX from here on in) Coolant will leak from the stack to header tank seal, tube stacks will get gunged up with scale and crud.
A man with a plan and plenty of patience is needed to restore order.
It was left to soak in some Sentinel X800 www.sentinelprotects.com/uk/products/domestic/central-heating-systems/sentinel-x800-jetflo-ultimate-cleaner can be used cold and has been used to great effect in unloved systems ( shut seacock, pump a gallon mixed at 2% around the system and leave for 24 hours) makes the job of knocking the tubestack out infinitely easier.
A nasty top hose connection from the thermostat - this is the route the hot coolant from the cylinder head takes on its way to being cooled and returned to the block by the water pump
The hot water passes around the HX tube stack via this port on the opposite side to the equivalent of the bottom hose - it means all the coolant HAS to go through the tubestack and be cooled by the river/sea water
Bottom hose connection
From this fitting The coolant has had its heat removed on its journey around the tube stack and is sent back into the block by the water pump - thus cooling the engine - the stat maintains the engine temperature; opening and closing as load demands. Note the corrosion to the o ring mating face.
A filthy tubestack ready for the laborious job of rodding out the core with a tube brush - the sort of job an apprentice is born for π sadly we donβt have one so I had to do it myself π€¬π§
Stack cleaned and all shite and briny - plenty of raw water can now flow through these little beauties π
The o ring mating face and stack OD was cleaned with a die grinder fitted with a Roloc medium Scotchbrite disc - you do not want to be doing that job by hand π§π€¦πΌββοΈπ€π¨π¨π¨βοΈ
I didnβt go too heavy handed cleaning it up, a smear of silicone grease with a pair of new seals is more than adequate.
Back on its mount, 1 1/4β top hose fitting in place with new gasket made
Returned to stock as useable spare ππ
Here is a crusty FH200 Bowman indirectly cooled heat exchanger - antifreeze whizzes around the engine; sea or river water takes the heat away -a properly sized and installed system is vastly superior to a keel cooled arrangement (until the intake blocks up....) as the cooling medium is as good as inexhaustible - itβs capable of cooling a 120 HP engine - same set up as the 67HP EH220 fitted to the BMC 1500 turbo (I donβt plan on using the FH but it needed sorting and relocating from work.....!)
The biggest failings are flakey impellers and tired heat exchangers ( referred to as HX from here on in) Coolant will leak from the stack to header tank seal, tube stacks will get gunged up with scale and crud.
A man with a plan and plenty of patience is needed to restore order.
It was left to soak in some Sentinel X800 www.sentinelprotects.com/uk/products/domestic/central-heating-systems/sentinel-x800-jetflo-ultimate-cleaner can be used cold and has been used to great effect in unloved systems ( shut seacock, pump a gallon mixed at 2% around the system and leave for 24 hours) makes the job of knocking the tubestack out infinitely easier.
A nasty top hose connection from the thermostat - this is the route the hot coolant from the cylinder head takes on its way to being cooled and returned to the block by the water pump
The hot water passes around the HX tube stack via this port on the opposite side to the equivalent of the bottom hose - it means all the coolant HAS to go through the tubestack and be cooled by the river/sea water
Bottom hose connection
From this fitting The coolant has had its heat removed on its journey around the tube stack and is sent back into the block by the water pump - thus cooling the engine - the stat maintains the engine temperature; opening and closing as load demands. Note the corrosion to the o ring mating face.
A filthy tubestack ready for the laborious job of rodding out the core with a tube brush - the sort of job an apprentice is born for π sadly we donβt have one so I had to do it myself π€¬π§
Stack cleaned and all shite and briny - plenty of raw water can now flow through these little beauties π
The o ring mating face and stack OD was cleaned with a die grinder fitted with a Roloc medium Scotchbrite disc - you do not want to be doing that job by hand π§π€¦πΌββοΈπ€π¨π¨π¨βοΈ
I didnβt go too heavy handed cleaning it up, a smear of silicone grease with a pair of new seals is more than adequate.
Back on its mount, 1 1/4β top hose fitting in place with new gasket made
Returned to stock as useable spare ππ