Rydlyme salt flush Volvo Penta 2003 - tubing ?

[poultey]

Performing a cooling system descaling with Rydlyme I'd like to know where to connect the hose for the 'return' of the Rydlyme solution once it's left the engine block. The tube connecting the exhaust elbow to the water distribution pipe that runs from front to back within the head looks to be the place to connect the sluicing hose at the exhaust elbow end ? However there looks to be a shoulder on each end of that tube making connection of a hose tricky. Any thoughts please ? I'm ok with introducing the Rydlyme into the block, removing the anode, impeller, thermostat etc.

 

[VicS]

Only some of the flow

Performing a cooling system descaling with Rydlyme I'd like to know where to connect the hose for the 'return' of the Rydlyme solution once it's left the engine block. The tube connecting the exhaust elbow to the water distribution pipe that runs from front to back within the head looks to be the place to connect the sluicing hose at the exhaust elbow end ? However there looks to be a shoulder on each end of that tube making connection of a hose tricky. Any thoughts please ? I'm ok with introducing the Rydlyme into the block, removing the anode, impeller, thermostat etc.

Only the by-pass flow leaves from the end of the distribution pipe. The main cooling flow through the engine leaves via the pipe from the thermostat to the exhaust elbow.

The two flows combine in the elbow.

(You will need to remove the thermostat or you will get no flow through the engine)

 

[poultey]

Only some of the flow

Only the by-pass flow leaves from the end of the distribution pipe. The main cooling flow through the engine leaves via the pipe from the thermostat to the exhaust elbow.

The two flows combine in the elbow.

(You will need to remove the thermostat or you will get no flow through the engine)

Thanks Vics, very helpful. For sake of completing the thread the tube between the thermostat and the exhaust elbow ( next to no.15 in the attached schematic) also looks to have a flange at the end but I'm thinking 19mm hose would stretch around the flange providing a reasonable seal.

 

[chris-s]

When i do ours, i remove and block the outlet on the back of the cylinder head that feeds into the exhaust elbow, remove the thermostat and then use the outlet from the thermostat housing as the return. This is a bit easier in our case as we have a take off for a calorifier. Its also handy to sacrifice an old thermostat by removing the ‘valve’ section as the body and seal are needed to seal the thermostat housing onto the head.

Doing it this way ensures that the cleaning solution is forced thru the perforated distribution pipe and the block, removes the risk that you could inadvertently back-flood the engine from the exhaust elbow.