carrera intake manifold torque value

Biff Bradley · Biff Bradley's Garage

Can someone please tell me the correct torque value for my 1989 Carrera intake manifold allen bolts?

Thanks very much.

stlrj · 09-06-2003, 02:23 PM

I don't have a specific # but when I did mine I did my best to tighten them just enough to squeeze the gaskets but not enough to strip the nuts.

Use your best judgement.

Cheers,

Joe

kepperly · kepperly's Garage

AS per the Bentley Service Manaul, on page 102-37 the torque
specs for the intake to cylinder head is 25nm or 18 ftlbs the same
figure for the heat exchanger by the way.

Keith Epperly 87 slant nose turbo look cabriolet "Carrera"

Biff Bradley · Biff Bradley's Garage

Thanks for the replies. Finally found it in Bentley. 10 of 12 were loose enough to turn with my finger. Might explain the hissing noise I was getting at high RPMs.

Just got finished extricating the valve adjustment blade I broke while doing the #4 intake this morning. That was fun. Now one of the tiny nuts on the tool is stripped, and I don't want to fish anything else out today. Can't find any loose valves, although the engine is ticking...

kepperly · kepperly's Garage

How may miles on your Carrera?

keith

B.Lane · 09-07-2003, 11:55 PM

18 ftlbs

Biff Bradley · Biff Bradley's Garage

52K miles. Put it back together and took it out after valve adjust, tightening intake manifold, and plugs. Seems to be running better, and quieter. Also found one plug that was not torqued down. I've had the car for about a year. Guess I should have checked this stuff earlier, but the car had a complete service history.

KTL · 09-08-2003, 06:40 AM

These inhex nuts are notorious for coming loose.

I'd recommend putting spring/wave lock washers under the intake nuts to keep them snug. Blue Loctite might be a solution too? Split lock washers would work too, but would probably dig into the manifold.

old_skul · 09-08-2003, 07:35 AM

Are those nuts easy to get to? 'Cause I think I'd like to retorque mine for safety's sake.

KTL · 09-08-2003, 10:54 AM

Quote:

Originally posted by old_skul
Are those nuts easy to get to? 'Cause I think I'd like to retorque mine for safety's sake.

Not too many of them are easy to reach. You can see them. But getting your hex tool on them is another story. I had good success by cutting the bend off of a 8mm ball-end hex key. Now you have a straight piece of hex key that you can stick into a 8mm socket which lets you pivot it a bit because of the ball end.

Works quite well. Don't know how well it'll work with the engine still in the car though. I tightened mine while the engine was out. Might have to make your key a bit shorter than I did.

Biff Bradley · Biff Bradley's Garage

I was able to reach all of them by removing the heater stuff on the left, and the entire airbox. Pretty easy. Had the A/C compressor off too, but I don't think that's necessary.