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Cylinder heads tighening torque

 
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mg907
Alfasud


Joined: 12 Dec 2011
Posts: 53
Location: Italy

PostPosted: Mon Mar 23, 2020 11:17 pm    Post subject: Cylinder heads tighening torque Reply with quote

Forced at home during these days for the reasons everybody knows I'm going to complete the reassembling of a 1.3 S3 hydraulic tappets carbs engine that was resting in my garage since long time ago.

After grinding valves, checking heads, checking pistons and bores, and replacing all hydraulic tappets with INA new ones, it's now time to fit the heads, and here comes my doubt.

In the Alfa manual I read:

...tighten the six cyilinder head retaining screws in two or three successive steps according to the specific torque and sequence:
81-87 N-m (60-60.4 lb-ft)
After having heated engine until intervention of the radiator cooling electric fan, on cold engine, oil and tighten the six screw securing head to base ...

The instructions paper that comes with Ajusa gaskets provides following advices:

tighten bolts to 29.4 N-m (22 lb-ft)
tighten bolts to 58.8 N-m (43 lb-ft)
tighten bolts to 88.2 N-m (65 lb-ft)
losen bolts 90 degree and then tighten to 88.2 N-m (65 lb-ft) again
run the engine till the total thermostat opening and then let it cool down
losen bolts 90 degree and then tighten them to 88.2 N-m (65 lb-ft) again


The tightening sequence is the same both in the manual and in the gasket instructions.

The main difference (apart the minor torque values mismatch) is that the gasket instructions advice to losen the bolts 90 degree and then tighten them again two times, before and after the engine warm-up/cool-down.

Which should be the correct procedure in your opinion?
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ZeNiTh-PbArM
Alfa 33


Joined: 14 Mar 2003
Posts: 422
Location: Paris, France

PostPosted: Fri Mar 27, 2020 1:42 pm    Post subject: Reply with quote

Hi

I've replaced a few of these gaskets and I always do as follows :
- use parts which are good quality. By all means avoid the Ajusa brand, this is the worst shit I've ever come across.I've seen engines completely destroyed because of these junk parts.
- lubricate the threads lightly using engine oil and tighten all bolts to 2m.kg. Then tighten to 4, 6, 8 then 9.
- start the engine, let it warm up gently at idle, wait for the fan to kick in two times, then shut the engine off
- wait at least one night for the engine to cool down completely
- For each bolt, unscrew one quarter of a turn then tighten again to 9m.kg

Regards
zp
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mg907
Alfasud


Joined: 12 Dec 2011
Posts: 53
Location: Italy

PostPosted: Sat Mar 28, 2020 6:29 pm    Post subject: Reply with quote

Hello ZP,
Thank you so much for you reply.
I'll follow your advice.
Engine is not on the car yet. And cambelts are not in place
So I've still the opportunity of removing the heads again and search for another brand of gaskets.

Mario
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ZeNiTh-PbArM
Alfa 33


Joined: 14 Mar 2003
Posts: 422
Location: Paris, France

PostPosted: Mon Mar 30, 2020 6:52 pm    Post subject: Reply with quote

Hi

Yes don't waste your time with ajusa parts, it is not worth doing the job twice.
Stick with Elring, Reinz/Payen, it may be a little more expensive but each time it is a trouble-free experience.
My parts dealer stopped retailing ajusa parts ten years ago since the failure and complaint rate was unbelievably high. Stay clear of this brand.

Regards
zp
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