overheating in my type 4

[pablovent]

i from Chile and looking for real empirical experience, need help for oil temp problem with my automatic Westfalia 1978 (stock 2000cc, type 4 - dual carbs), my interest is only summer use with long travels with my family (need fiability) ....temp range in my country in summer is 75-95 Fº. Rebuilt 20 or 30 type 1 engines without problems, but first experience with a type 4. Is second time rebuilt my engine in 2 month.....first time (without fuel pump push rod install) overheating and melted after only 40 miles run......possible causes: plugs white lean, timing incorrect 10-12º btdc, 7,8 CR, possible low oil pressure, etc....Now i rebuilt again (very expensive) crank completly machined 0,25 and check, new bearings, new piston and barrels kit, heads ok, and install aftermarket Schadeck oil pump (1829 CB performance for type4/914) fit ok , holes alignment, but difference size holes oil pump, 7,3 CR , 3º btdc to 850 rpms with 28 max (without vacuum hose connected), and increase 125 fuel jets to 140 size....This time installed oil pressure and temp gauge for better control.

First check:
Runs very well but 20 minutes or 3 miles 195 Fº oil temp...with 10-40 psi oil pressure range.....

Second check:
With 88 Fº exterior temp........20-50 psi cold engine oil pressure.......and hot:
70 km/h
2500 rpm
7 idle - 25 psi max oil pressure
230 Fº oil temp
20W/50 oil
After highway road to my house oil temp 240 Fº and oil pressure max 20 psi.

Check again timing and without vacuum hose 28º max....with vacuum hose 35º aprox.....and 3º btdc idle.....idle is fine???
Considerer this.......but need make sure correct position cooler flaps 100 open and need jets recommend for dual solex 32-34 pdsit-3, now installed 140 mains, idle 52,5, airs 160, stock rest.
My fear is overheating again.

Appreciate your advice
Best regards and thanks.
Pablo V.

[Editor]

Pablo, we don't get such high air temperatures very much in the UK. I have heard of another Type 4 engine owner in the USA who has had lots of trouble with low oil pressure since he rebuilt it. I think he is waiting for the spring thaw to be able to work on it again. You could try www.vwtype3.org - he is on there, and I am sure will tell you what he has tried.

Meanwhile someone here may be able to give you some ideas.

[ar_kid]

Check the oil pressure relief valve is opening and it is flowing oil through the cooler.
This is essentially an oil viscosity by-pass valve which will 'pass' as the oil heats up and becomes thinner.
Changing pumping pressure or oil viscosity will affect its operation.

[pablovent]

Check the oil pressure relief valve is opening and it is flowing oil through the cooler.
This is essentially an oil viscosity by-pass valve which will 'pass' as the oil heats up and becomes thinner.
Changing pumping pressure or oil viscosity will affect its operation.

yes, i check the oil relief piston, seat and spring (stock lenght and pressure).......but now use 20W/50 oil.....in hot 20 psi max sure oil lighter and sure up position...my problem is overheating.....but two questions :

1.-My automatic Westfalia 1978 type 4 2000cc use dual solex 32.34 pdsit-3...this carbs are factory installed in this model??
2.-need fix the cooler flaps in max open or cooler position all the time....the passenger flap completly open in horizontal position...and driver side flap down completly to oil cooler seat tin??

Thanks...

[pablovent]

Pablo, we don't get such high air temperatures very much in the UK. I have heard of another Type 4 engine owner in the USA who has had lots of trouble with low oil pressure since he rebuilt it. I think he is waiting for the spring thaw to be able to work on it again. You could try http://www.vwtype3.org - he is on there, and I am sure will tell you what he has tried.

Meanwhile someone here may be able to give you some ideas.

Thanks....but in http://www.vwtype3.org... exist forum??.....is possible name Usa owner ??

[Editor]

I see you got on there - some good advice coming. It's an email list - you sign up.

[pablovent]

I see you got on there - some good advice coming. It's an email list - you sign up.

Hi again....i have problem now...need rejetting my dual carbs for lean, but Automatic Westfalia type 4 2000cc only EFI in USA .....exist less information and experience for dual solex 32-34 pdsit-3 stock jets......this carbs use in Europe...is possible stock jets information for type4 2.0 automatic Westfalia??

Thanks and kind regards.

[Editor]

The parts book only gives the '69 carbs info. Main jet x132.5 and idling cut off jet g55. I guess for 2litre you might need larger, but I'm no carb expert. Someone on here probably is though. maybe someone on the Type 2 Owners Club forum might help. www.vwt2oc.com/