'shake' on shutting down diesel, meths and water pumps!

Pathfinder,
From my limited knowledge of waterpumps I'd say a leaking pump is a precursor to the pump packing it in so I would be changing the waterpump, unless ofcourse it is leaking from the gasket which is a different porposition again.

regards
Toolman

Not sure about meth but Tolulean, Is used as a octane booster in petrol engines you can if you wish go as high as 30% mix of the stuff in a regular engine if you are game.

Hi If the engine shakes more than it used to on shutdown the 1st place I would check is the engine and gearbox mounts.
Regards
Tour Boy

Change that pump. Agree with above about engine/gearbox mounts. Could also be that the fuel system isnt shutting off fully. If the car is going in for repairs/service and you have water woes, I wouldn't worry about additives, would just get your mechanic to drain and flush your tank, change fuel filter and take it for a blast.
Tanka.

Severe shaking and "running on" of the motor after you've turned it off can also point to the diesel fuel pump.

Mate,

Re the meths. When I bought the LC 100 last year someone (I know who) told me that you can add meths, cant remember the amount or frequency, but the purpose was to ensure that you get rid of any water that may be in your fuel.

RB

Yep change pump. I know if the timing belt needs doing its not worth doing if water pump is dodgy but i wouldn't change the belt just because the pump needs doing unless of course it is close to needing to be done.

Hi Pathfinder,

About the shakes on shutdown, I agree with checking the engine and gearbox mounts but it might also be the fuel solenoid on the injection pump no longer sealing positively. It's on the back of the pump, just above the outlet pipes to the injectors. Remove the wire connector, then the whole solenoid screws out - it's a big hex - maybe 25mm? Take the solenoid and the plunger to a Bosch diesel injection specialist and they should be able to fix you up with any bits that need replacing.

Re. the water pump - if it's the shaft seal, it's only a matter of time before it goes completely. For the cost of a new pump, it's not worth the risk of a major coolant loss and cooking the engine.

A few hundred ml of metho in a tank of diesel isn't gong to cause any problems and should disperse small amounts of water but, if you're already using a diesel treatment, these are all, AFAIK, supposed to disperse water, kill algea, improve pump and injector lubrication - and make you a cup of coffee before you've even realised you want one! I've been using Aust-made 'Diesel Doctor' for a while and I'm happy with seeing less water and a bit more lumpy crud in my sedimenter at each check.

Hi Guys,

I want to say that I completely agree with the advice given by Ian from Thermoguard Instruments.

On many vehicles nowadays the top radiator hose & thermostat housing are the highest point in the cooling system, so running a vehicle with low coolant level can easily cause an air lock and wreck the engine.

Modern radiators have quite small header tanks and the top hose forms a part of the coolant reserve above the cylinder head.

PATHFINDER:
Don't delay, change that water pump.
If the coolant level drops suddenly the temperature gauge may actually go down
and give you no warning as the sensor needs liquid around it to work properly.
Also make sure you flush the system at the same time.
Water pump seals are damaged by any impurities in the system.

Regards
David Jones
Enginesaver Low water Alarms