Hi, I am trying to get an idea of where is the air pump on the GTBi engine and what it looks like. The only information I was able to get is from the technical drawing of a GTB, which is midly informative: Image Unavailable, Please Login Does anyone have a few picture of the air pump in place in the engine bay? Thanks, Sly
To a novice it looks like the pump is next to the timing belts The diagram actually is confusing...the pump is pictured on the right side of the engine and the bracket that holds it (7) is on the left...
I understand what side it's on, but I can't find a picture (I should probably say a photograph) of the entire assembly in place in the engine bay. I will be checking a 308 whose air pump belt has been removed and want to check on the rotation of the pump to make sure it spins freely. Just would like a have a visual before I go. Thanks! Sly
Sly I found this photo here: Pix For > Ferrari 308 Gtsi Engine I drew the red circle around the airpump. It should not spin with a flick of the finger - it should have some resistance. They are easily rebuildable, as well. Best luck the FiatRN Image Unavailable, Please Login
I am guessing many owners removed them completely given the very large number of engine pictures without it! S
Reportedly, when they suddenly freeze, they have been known to shudder the cam, shear belt teeth and KA-Boom. No personal observations though. Mine had the belt removed when I bought it and was frozen solid, junk. Removed.
It's the same as my 1974 Jeep J10 AMC V8 360. You can get it at autozone. You will need to reuse the air pump nipple to hose or fab one which should not be that hard.
Mark, I thought I read a post from rifledriver on this subject a while back where he said this was a wives tale. Can't seem to locate the thread at the moment. Can anyone confirm this? As I had intended to put the air pump back on my 82 GTSi
From what I've seen, the GM pumps are the same. Couldn't tell you exact yr or make but they are not Ferrari made parts. Napa # 51212 is one that has been referenced over the yrs.
smg2 My question was in regards to the smog pump freezing and taking out the top end of the Valvetrain as a result.. Thought Rifledriver said this was a wives tale as it would just snap the serpentine belt. Was hoping someone could confirm I read that correctly.
In '83 Ferrari went to the trouble of adding a bearing and shear pin to the smog pump pulley drive assembly. Allegedly this allows the pump to seize and have a way to release from the engine without doing further harm. Seems like a lot of trouble and expense if it is just a wives tale.
Ahh, missed that. Not sure, it'd come down to the hp of the belt and the condition of the sheave aka pulley. I wouldn't be surprised if it caused the timing belt to jump a few teeth though if the pump did lock up suddenly.
Kim, I'm running the smog pump on my 308 (pump for an early 80's V8 Camaro from NAPA was identical in all respects to the one I took off). The belt that runs the pump is very tiny, almost like something you might find on a sewing machine! By comparison to the cam belt, the smog pump belt is a featherweight. It is definitely a David and Goliath situation. And the pump is not particularly robust. In fact, I believe my pump came with an admonition to not turn the pump backwards as it could snap the vanes inside. If the vanes are that frail, seems the only seizure that would possibly overpower the timing belt would be bearing related. And that should be squealing like a pig well in advance of total failure and stoppage, you'd think? Despite all of that, perhaps it would be prudent to keep the smog pump belt a bit loose? Seems it would allow the belt to spin harmlessly on the pulley if there is sudden catastrophic failure of the pump. Jeff
Thanks for the input guys! Yes, I might want to make a few modifications as you have suggested. Always hate to be on the side where later on you say to yourself, " Wow, sure wish I wouldn't have done that.."
