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T O P I C    R E V I E W
PipsovichPosted - 16 Dec 2018 : 20:57:22
Hello!

Im having a really hard time with my 95 V4.



Problem is that the coolant stops circulating, causing the car to overheat and the heat from heater to stop.

If the car is not moving it all works fine and can run like that for as long as ever.

Water pump is new, with the straight vanes - is there anyone that has used this successfully?

Both head gasket new, and yes they are mounted the right way.

New thermostat

New radiator cap.

Tried to fix this for days now, it is driving me insane... Please give me some new ideas!
15   L A T E S T    R E P L I E S    (Newest First)
mellePosted - 05 Mar 2019 : 08:57:25
I've worked on and broken a good few V4s and I've never found a difference between 1.5 and 1.7 heads or head bolts, nor does the parts book mention any differences as far as I'm aware (only between open and closed deck engines). That being said, I've never actively compared the parts, will do so next time I'm in the workshop, always happy to learn something new!

The difference in manifold bolts is related to the type of manifold, nothing to do with 1.5 or 1.7.

www.saabv4.com
diggerPosted - 05 Mar 2019 : 07:11:52
In Jack Ashcrafts guide to tuning he mentions differences between 1500 and 1700 engines which as well as the crankshaft and pistons he says include the balance shaft, CYLINDER HEADS, intake manifold, valve springs, some manifold bolts and the CYLINDER HEAD BOLTS. He goes on to say the only item that won't interchange are the 1700 cylinder head bolts as they are 7.5mm longer.
mellePosted - 04 Mar 2019 : 16:07:16
Heads for high and low compression engines are identical, also the industrial ones.

www.saabv4.com
DerekPosted - 04 Mar 2019 : 11:35:34
Could the "thick" head be a low compression one from an industrial engine, pump or forklift?
James RanaldiPosted - 04 Mar 2019 : 10:04:33
Very interesting , well done .

1968 V4 96 ,LHD
1984 99 GL
1992 C900i Convertible
1993 C900 LPT Convertible
PipsovichPosted - 04 Mar 2019 : 09:54:23
Yes, very nice to have her running now i tell you!
Would be glad if i could find out if the head is of another type or what kind of head it is, at least. Good to have spare heads if they are ok :)

Sonett - 72
95 - 73
99 - 70
96 - 63
93 - 59
9-3 cabriolet -99

And a few other nonsaabs
Leyland 1000 -78 1.6 16V
Peugeot 404 -66
Volvo 244 -77
DirtbikerPosted - 03 Mar 2019 : 21:20:45
Well done for figuring it out!
I have an open deck engine in bits - I will measure when I get a chance and let you know.
Cheers
mellePosted - 03 Mar 2019 : 20:32:55
Good to hear you found the culprit! I'd say with such a difference, one must me an open deck head? I have an open deck engine, but I've never had it apart nor have I studied the heads, so I'm not sure what the exact differences are, but you surely can't shave 7mm of a closed deck head.

www.saabv4.com
PipsovichPosted - 03 Mar 2019 : 18:17:21
SOLVED! or at least it seems so!
She runs now, very nicely, with the other set of heads, but i found out this:

The passenger side head differs in height from the other head with as much as 7 mm! This made the bolts just a tiny bit too long, so that the heads weren't tighened down properly, but enough to make her run and get good compression without any load...
The old head also has a little different design than the other ones, the bolt near the exhaust port is a bit "further down" in the head, also the exhaust port is affected by this. See the pictures.

In the pictures you can see that the threads on the bolts is a little bit damaged at the ends.


The old head. Bolt at exhaust port is shorter.

"New head".

Bolt protruting through "new head".

Damaged head bolts.

The same bolt, protruding through the "old head".

Sonett - 72
95 - 73
99 - 70
96 - 63
93 - 59
9-3 cabriolet -99

And a few other nonsaabs
Leyland 1000 -78 1.6 16V
Peugeot 404 -66
Volvo 244 -77
mellePosted - 01 Mar 2019 : 14:30:39
I may order a set of these to play with: https://www.ebay.co.uk/itm/371040603133

www.saabv4.com
mellePosted - 01 Mar 2019 : 14:23:35
Read up on dye penetrant testing, interesting process. Looks like something I can use in my shop, unlike Magnaflux. I have a background in industrial design and a healthy interest in metal casting and engineering processes in general, always good to learn something new.

On another note: it looks like your rad has a vented cap fitted, this should be on the overflow bottle.

www.saabv4.com
PipsovichPosted - 01 Mar 2019 : 12:42:24
That is not a relevant indication, but you are right, it looks like that in the picture. I mostly did the pt on the heads to find any pores so did not bother too much with the chambers as i had mt tested them before.
That sounds like a interesting job you had! I am an pressure vessel inspector.

Sonett - 72
95 - 73
99 - 70
96 - 63
93 - 59
9-3 cabriolet -99

And a few other nonsaabs
Leyland 1000 -78 1.6 16V
Peugeot 404 -66
Volvo 244 -77
DerekPosted - 01 Mar 2019 : 11:47:35
Looks like you have a crack between the ports in the first shot? I once worked in the x-ray department of a specialist foundry and have seen this system used a lot. They used a dip tank for big items. We would find the cracks via x-ray and they would then weld. Ali and Magnesium, recheck with DP and then x-ray again. They would sometimes do this several times before rejecting the casting. Jet engine parts and similar things are a bit critical. We did F1 wheels as well and they got similar treatment.
TTruckiePosted - 28 Feb 2019 : 21:08:23
yep - they are closed deck heads
TTruckiePosted - 28 Feb 2019 : 21:07:10
yep pretty sure they are closed deck heads

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