Removing the air delivery body of a 328

Leave it attached to the intake runners. Remove the nuts holding down the intake runners and lift up as a unit. Other things need to be removed as well like the start injector, and the throttle cable, and the large air pipe. Couple of vacuum lines on the other side, etc..

 

Sorry Manno,

That was bad advice I gave. I looked at it again and here is what I did.

Remove large air intake hose
Remove throttle cable and throttle housing.
Remove all injector lines to make room
Remove cold start injector line
Remove the crank case ventilation hose between 2 heads
Disconnect a couple vacuum lines left side and underneath the throttle housing
Modify one of the 13mm wrenches to fit the nuts underneath that box. Then, use it to remove about 10 nuts underneath the box.
Lift box up, runners stay in

Reuse gasket on the way back.

 

I would not recommend removing the plenum on it's own. do as the other poster stated and remove in one piece with the intake.

the injectors come out - I use a needle nose and screwdriver as a fulcum and pop out. but youwill need new o rings to put back in.

taking the plenum out on its own will require you to un bold from underneeth the plenum - akward at best.

you will need to remove the banjo bolt - these are sensitive to too much torque.

IF you do take it off, then you MUST use new gaskets all round and sealant as an air leek here is very likely, and a pain to correct once back on the car.

BE ware there are small inserts/ spacers on the plenum that you MUST MAKE SURE YOU DO NOT DROP INTO THE INTAKE!!!!!!!!!!!! ... again main reason to not take it off on its own.

 

In order to remove the intakes and the plenum in one its made much easier if you loosen (not remove, just loosen) the 8 nuts that hold bolt the plenum to the intakes. Its very difficult to get off if you don't do this.

 

ABSOLUTELY.

I have taken the plenum off by itself as I cannot get the intakes loose, but the pucker factor is beyond VERY High.

 

Hey Alfer, we can do better than pics......
It's Sunday, just washed Kato the Ferrari....saw your post...thought I'd do a re-edit of an old video.
Hope it helps ;-)

https://www.youtube.com/watch?v=R0o8FMIR0Ek

All the best, Bell Bloke

 

Nobody mentioned the stand off washers that keep the rubber gasket from crushing too much. When lifting off the plenum you need to be very careful that they don't fall out of the gasket and into the intake runners, and possibly into the cylinders. Part number 6 in the diagram shown here. Ferrari 328 (1988) Parts : Table 16 - AIR INTAKE AND MANIFOLDS

 

It is right handed thread, so regular directions.
You need to use a pair of vise grip to grip the ball end, or the cable end, then use a small wrench on the nut. Crank away, there is no other way.

 

Replace those coolant hoses while you can see them. Crank down hard on the hose clamps

 

I have never seen injectors with such a groove, so I am also interested in finding out why this happened

Nice that the intake plenum has been removed succesfully now.

 

Better yet, have a good look at/think about how you orientate the hose clamps when you put them on so that you can get a flexible nut driver onto them again after you re-install the manifolds and plenum. You will need to tighten them up again & a little bit of thought (and maybe a test fit of the inlet manifolds) will save you hours of grief!

 

Neat thread, but I always change the cooling hoses with the plenum installed. It does help to remove the oil filter. (17 years working on biz jets, and I have small hands!)

Cool pics, and info on the injectors.

 

Intake air temperature should be darn close to ambient air temperature (unless you have a turbo/supercharger).

 

New injectors are relatively cheap as long as you buy them as Mercedes parts. I doubt you could have them tested and cleaned and save much money over new ones. If you don't buy the dogma that the new brass injectors are inferior to the old steel injectors, then new is the way to go.

I would line those wear marks up with the intake runner and figure out what it is hitting or rubbing against. Perhaps you need new bushings? I'm not familiar with the 328 injector holders enough to know, but I would definitely get this sorted out before putting brass injectors in. What wore a groove in steel would probably saw right through brass.