[T3] type 4 2000cc oil pressure and overheating problem

[Dave Hall]

Pablo asked about this on our UK Type 3&4 club forum, but we don't get
consistently high air temperatures here, so I referred him to type3.org as I
know Keith had problems with his Type 4 rebuild.  Hopefully when Pablo has
checked all the things that have been mentioned, he may find the problem,
but I've a feeling Keith hasn't fully solved it yet, though.

Dave.
UK VW Type 3&4 Club
===================

Jon Stiles' reply snipped.

>
> On Fri, Dec 9, 2011 at 5:21 AM, pablo vial de ruyt
> <pablo_vent at hotmail.com>wrote:
>
>>
>>
>>
>>
>> Hi, 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 solex 32-34 pdsit-3), 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.
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