location of the following pumps..

[BillyW124]

Hi Guys,

Can anyone tell me the location of the:

fuel pump
water pump
oil pump

on a M11 124

 

[Druk]

Fuel pump..underneath, iirc just in front of the O/S rear wheel.

Water pump...front of the engine behind the fan.

Oil pump...inside the sump.

 

[BillyW124]

Thank you Durk,

Now being the obsessed person i am being precise and all, if any of these where to be on the way out what symptoms would i expect to be seeing?

these, to my knowledge are in all working order currently, this would be for reference in the future and would be quick to tackle it..

 

[grober]

Fuel pump[electrical] - under the black plastic cover just in front of the offside rear axle

Water Pump =main engine circulation pump- front of engine behind the fan/viscous coupling pulley driven by poly v belt

Oil pump= main engine oil pump -in the front of the sump.

Power steering pump--- front of engine[offside]driven by poly v belt
DRUK BEAT ME TO IT!

Fuel pump failure= engine won't run

water pump failure= overheating + water leaks+ noise

Oil pump failing= low reading on oil pressure gauge- increased engine mechanical noise
OR
oil pump failure= engine wrecked usually

Water pump failure is quite common but usually easy to spot -the others don't often fail.

 

[BillyW124]

Fuel pump[electrical] - under the black plastic cover just in front of the offside rear axle

Water Pump =main engine circulation pump- front of engine behind the fan/viscous coupling pulley driven by poly v belt

Oil pump= main engine oil pump -in the front of the sump.

Power steering pump--- front of engine[offside]driven by poly v belt

Hello Graeme,

hope you are well?

ok so im assuming that the fuel pump is in the same location under the black cover where the fuel filter lies then.

ive been reading/hearing alot about Viscous coupling. what does this mean? i have non a/c.

oil pump- in the sump or out of the sump?

power steering pump as im pretty sure its the cylindrical looking object with a rubber screw when opened reveals power steering fluid?

 

[grober]

Hello Graeme,

hope you are well?

ok so im assuming that the fuel pump is in the same location under the black cover where the fuel filter lies then. Correct They are side by side

ive been reading/heariing alot about Viscous coupling. what does this mean? i have non a/c. Its a fluid clutch that only engages fully when the radiator gets hot- a failing one shows by the car running hotter in traffic

oil pump- in the sump or out of the sump? Inside -you can't see it

power steering pump as im pretty sure its the cylindrical looking object with a rubber screw when opened reveals power steering fluid?

yep

 

[BillyW124]

ah ok nice one, one thing that never happens in this car but when i had my e200 saloon sitting in traffic on a hot day would rise, but nothing too dramatic. Viscous would explain that one!

i have good oil pressure currently (i think), when the oil is really warm only then would i see the needle drop slightly below or between number 3. This is when i have completley stopped and in D. obviously when i drive off the needle rises back up to 3.

Questions: when i put gear in to P the guage will rise back up to 3. Is this normal?

as the gauge only moves up and down when the oil is very warm (or peak) is this supposed to happen when warm only or when cold as well?

this one is a bit tricky to explain, on occasions, sometimes i see the oil gauge drop and rise back up quickly when approching a stop, but this only happens if ive had my foot off the pedal but then accelerate again, this would be a split second drop to arould below 3 (more than usual) and will be fine again.

in essence its like the supply of oil prssure drops or is cut momentarily. Would this be a sign of somthing?

 

[Ian B Walker]

Oil pressure. When you switch on the ignition the oil pressure gauge should remain at zero. Only when the engine is running should it read 3 bar. If your gauge jumps to 3 bar with the ignition on and the engine not running then the oil pressure switch is at fault. On an E class M111 engine this is situated at the back of the engine on the passengers side just above the starter motor. On a C Class with the same or similar engine it is situated under the exhaust manifold. Oil pressure is deemed acceptable if, on a hot engine, at tickover, at 0.2 bar but must rise to 3 bar at 1500 rpm.

 

[BillyW124]

Cheers Ian.

yes this remains at zero before the engine is on. Well when i say zero it lifts off the rest ever so slightly and remains there, i'm assuming that this is some sort of the 'left over' pressure in the system from the last run?