Engine Sender Units - Diesel

[Mark S]

Can anyone tell me definitively (with picture ideally) or point me to link that identifies the various sender units on and around the diesel engine? From what I believe:

Water temp sensor in hose flange on side of cylinder head: glowplug temperature sender.
Oil filter housing: oil pressure sender.
End of cylinder block: water temperature gauge sender???
Not known: additional water pump activator (JX engine) - most keen to know this as about to fit pump.

Any others?

Many thanks.

[garyd]

My VW manual confirms:

temp sensor on side of cylinder head - glow plug system
Oil pressure sender on filter housing (0.9 bar for TD engine)
water temp sender (temp gauge) - on rear of cylinder head

also
'low pressure (0.3 bar)' oil pressure sender (buzzer?)- on rear of cylinder head.

The turbo cooling pump starts after engine switched off if water temp exceeds 107*C. This infers that there must be another temperature switch somewhere but I've not found it in the paperwork yet.

I will try to see if I can sort out anything further for you. Otherwise, I hope to be at the syncronauts 'Mendipidy' event (somewhere near Cheddar) over the bank holiday weekend so maybe you could call in and check the system out yourself? (I now have a GTi engine but everything is still very much the JX set up.)

[syncroandy]

The part numbers and function of these senders fitted depend on the age of the engine and whether turbo or normally-aspirated. Early vans have metal flanges with screw-in senders and a single blade terminal, late vans have push-in senders with two-pin JPT connectors. TD Syncro's have an additional circuit for turbocharger cooling which runs off the same thermoswitch (F95) used for coolant circulation run-on on 2wd TD vans.

Some data for late TD's:

VW Transporter 80-92
JX engine temperature sender data
From chassis ref. 24-K-064851

Ref Description Wire colour Sender part number Colour
F95 Thermoswitch for coolant circulation run-on Brown/Red & Brown 251 919 369 F Brown
G27 Sensor for engine temperature (glow plugs) Blue/White & Brown 251 919 501 A, 251 919 501 D Black
G2 Coolant temperature gauge sender Yellow/Red & Brown 251 919 501 A, 251 919 501 D Black

Circuit diagrams:

http://syncrosport.com/info/wiring/

Part numbers and fitting locations:

http://www.partsbase.org/vw/typ-2-syncro-t2-eu/