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 V4 engine rebuild - 1730 + trick-bits

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T O P I C    R E V I E W
TTruckiePosted - 19 Oct 2012 : 12:18:33
Hi all,

After collecting bits and bobs, some hot, time has come to start the rebuild.
I have stripped the donor closed deck block. It was a bit of a gamble as it had been sat in a damp shed for 20 years!
The oil (and water) was drained - a slow job as it was thick and lumpy!

Amazingly the crank turned and every bolt was loosened without any shearing - a dream engineering job.

The donor is a closed deck block that I am planning to fit open deck heads to as they are gas flowed. Apart from a couple of small differences in water way location (most blocked off anyway) I don't see any reason why this wont work. I'm using the closed deck block as a donor as it is stronger. (I was originally going for 93mm pistons but now going for the 90.8mm pinto pistons)

Does anyone know why I cant use open deck heads on a closed deck engine?

I will keep you updated.

15   L A T E S T    R E P L I E S    (Newest First)
Aero-EngPosted - 17 Jun 2013 : 22:23:05
Good article in the SAAB OC Driver! You didn't mention you were having to build a new engine though...!


"STIG" '71 Sonett III, "SIGNILDA" '62 Bullnose 95, 9-5 Aero
hillbillyPosted - 15 May 2013 : 20:04:29
That engine looks great, I hope everything is ok now.
TTruckiePosted - 14 May 2013 : 22:28:56
missing core plug!

in and out
ps the rocker covers are not final - used old ones as chain rubs.
TTruckiePosted - 14 May 2013 : 18:37:59
loads of bolts and other things..... including a 'spare' core plug!!!!

as they say 1 step forward and umpteen back!!!

Finished the engine, fitted it, connected everything up. Pressure tested the pistons (160-170 PSI). last thing to do was to fill it up with water....

in went the very expensive coolant and then out poured the coolant!! as fast as i could top it up, it pee'd out the bottom from the flywheel area. I looked at my spare engine (1967) to see what what wrong.... nothing was obvious.

After much head scratching I had to disconnect everything and pull the engine - diary simply says bugger! As soon as the engine was out I could see a core plug sized hole behind the flywheel that was bereft of a core plug! 45 mins later core plug fitted and engine ready to go back in.

What else will I find...........
Aero-EngPosted - 06 May 2013 : 23:38:29
Looking good. Found any bolts left over yet?
TTruckiePosted - 02 May 2013 : 22:40:56
as usual - 1 step forward 2 steps back!!!

the big high flow V6 oil pump didn't fit in sump so a little 'fettling' was required!!!

almost ready to go in! hopefully this weekend

hillbillyPosted - 02 Apr 2013 : 21:09:19
looking good.
TTruckiePosted - 01 Apr 2013 : 22:17:06
pistons are in and new metal timing gears from Malbrad fitted

To fix the issue with open-deck heads on a closed-deck block, I had the head welded up to fill the cut out on the open-deck heads (marked by black pen)

TTruckiePosted - 28 Mar 2013 : 10:25:59
Core plugs fitted

Crank fitted

Pistons - old/new

All going well until the new conrod bolts were missing! Tracked them down at the balancers - had to go over and pick them up. Fitting the pistons did not go well and I managed to bend a oil control ring!!! arrgghhhhhhhhh! The oil control rings on these new nural pistons are wafer thin. now need a replacement.
TTruckiePosted - 25 Mar 2013 : 09:33:43
Thanks Hillbilly I shall check it out and ensure it works.
hillbillyPosted - 25 Mar 2013 : 08:04:09
The timing set has a dedicated oil feed, the oil is supplied under pressure through a angular hole in the block to the gears and drains back to the sump. The oilways will need cleaning and clearing with compressed air.
Aero-EngPosted - 24 Mar 2013 : 23:13:25
That's why SAAB/Ford fitted a fibre wheel. But oh, no, you can't just agree with the design Engineers can you....

Looking good!
TTruckiePosted - 24 Mar 2013 : 18:23:36
Just thinking......

I got a set of steel/alloy timing gears from Malbrad, as they don't get any lubrication from the oil system do them need a bit of grease or graphegen when fitting them?
WoodyPosted - 19 Mar 2013 : 00:17:37
No I don't.
Saab don't list them as replaceable, neither do Motomobil.

It is a question for an Engine shop. Ford got them in there somehow so you would expect them to be replaceable.

Correction:- Mis-read the parts book, Saab do list them -8810962 Water Pipe Inlet , Qty 2. Item 8 below:

TTruckiePosted - 18 Mar 2013 : 22:40:17
has anyone tried removing and replacing the corroded steel water pipes in the back of the block?

If so.... how and what did you replace them with?

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