308 Diverter Valve

Check your local Checker or other parts supplier--take the bad one with you. They can match it up. Dealers are a lost cause for this "old" stuff, or if they have it the price will cause you to bypass! Tell them you think it's off of a '78 Camaro engine--not a Ferrari. I tried it--it works, and they even have the air pumps although the pulleys need changing. Good luck.

 

If you are talking about the "check valve", AdvanceAuto has it for $6.95. Just bring your old one, the counter guy called it an "air pump check valve". Hope this helps.

 

does anyone know if the 308 & 328 valves are the same..if so will someone post partnumbers?

 

Daniel that diverter valve looks identical from my 76/77 Lancia Scorpion

 

You've asked sort of a trick-question (because not all 308 have the same type of air injection system), but the short answer is that your 328 does not use this Diverter Valve. The Diverter Valve is only used with the continuous-single-air-pump-equipped '78-'83 US 308; your US 328 and '84-'85 US 308 (with the "pulse"-based air injection) use a (simpler) Cut-Off Valve 121751 (good illustration of your system is in your OM). Sorry, don't know if a generic alternative is available (and I'm really surprised, but glad, that there is a generic equivalent for the Diverter Valve) -- is the Cut-Off Valve 121751 now unobtanium or poorly-priced? (It's used on a fair number of the mid-80's to mid-'90s US F models).

 

Dan:

The check valves are the same as late 70's Chevy, but the diverter valve seems to be a Ferrari only part. I think a Volvo or something has a similar one. If you look at a website that sells these perhaps you can put "diverter" in and find one that looks/works like a Ferrari one. Bad check valves will cause the diverter to burn out so be careful about putting a new diverter on car with old check valves is not a good idea.

On the 328, the air injection system only works for a few minutes during certain part of the warm-up cycle (to check, put a vacuum gauge on the vacuum line going to the diverter). When you take your car to a smog test you should have it as warm as possible so the air injection system will be-off and there is not a recording (like OBD2) so they will not be able to test a functioning diverter or not.

Unless you are concerned about having all original items present and working you can probably get by with a dummy diverter. The Ca smog test will not get into the diverter working or not.

Mark

 

Steve,
Sorry...does anyone know of an equivalent or have a cross reference part number for the check valves in a 328, part # 121769.

 

www.allferrariparts.com $32.00 clams

 

Sorry, this is the one I bought two years ago for $9.88...it's now 19.99.http://www.partsamerica.com/ProductDetail.aspx?MfrCode=GPS&MfrPartNumber=7792929

 

I think there might be several air injection check valves that could work OKish. The hose connection side of that partsamerica one looks a little smaller in diameter than I recall, and if you look at the photo in this thread:

http://ferrarichat.com/forum/showpost.php?p=136151663&postcount=97

I'd say the same thing -- the hose connection on the "new" one looks a little smaller than the hose connection on old one -- but not impossible to use either with the right hose/clamps. IIRC, the female thread of the check valve is something like a 3/4" NPT and that seems to be a common value on all of them -- just match up your old one with a new one.

The part numbers I have in my old files are:

GM #22048214
Standard AV7

 

Thanks everyone...

Steve, the part numbers from your files, are those for a 308?..or does the 308 & 328 use the same check valves...LOL..
Hate to be circular in my discussion, but is seems that your GM part number does not match up wit Clyde M..(who lists a 308 on his profile)

Thanks,

Mike

 

The Standard AV7 is what I actually used on my ex-308. Can't recall where/how I got that other GM part number (nor if it's even correct) -- all I can say now for sure is that I wrote it down in my notes at some point in time

You know I'm not 100% sure if the 328 check valve is the same as 308, but I'll be a little surprised if it isn't. The same 121769 check valve is used on my TR, and, although I haven't measured it, it sure looks like the 308 check valve (in my mind).

I'll have to lay the task on you to tell us if the 328/TR check valve is something different from the 308
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Steve...LOL..

Ok.. I will do what I can
Thanks
Mike

 

Bill Hodel, a smog parts specialist, stocks all this stuff. I've been able to purchase NOS Diverter Valves and check valves for Daytonas and C/4s from him.

Yes, they are in fact GM parts. The TR check valve, while different, will work right back to a Daytona. It just won't be concours correct.

Steve

 

I am trying to find a DV for my 308 GTS, Diverter Valve G.M. 7030761. I went to NAPA, and they indicated it was no long available. We searched the catalog and found a similar GM part (NAPA 2-721) which was $270.

Any thoughts on less expensive options?

 

Slightly off point but probably in the same family...... years ago I needed a smog pump (Air injection pump) for my '82 Mondial 8 (Basic 308) because PO had removed all the smog equipment. In order to restore the system, I asked my friendly Ferrari parts guy for one $450.00 over the counter (1990) YIKES!! .....but he said he had shelf full of used ones that they had taken off cars back in the day (Georgia). He was willing to sell me a used one if I could find one that wasn't seized, a common problem. All the used ones on the shelf were seized.
Seeing that I was bummed he declared " Screw it go buy a new one from NAPA. I think they are the same as the one's off a Chevy pickup truck". I wrote down the casting number off the back of the pump. I went to the parts store putting 2+2 together .....1982 & Chevy pickup truck turned out to be a Chevy S-10. Right out of the box same exact same casting number on the back of the pump and $45.00 later I was happy camper. Look for your same year for parts from the Chevy line. My diverter valve (diverter union?) (at the time was 65.00) I got from Ferrari because it had 2 metal pipes that went to the catalytic converters so I knew this was not a typ. Chevy configuration.

Years later a professional mechanic showed me how to adjust the tension on the pump drive belt. Its a small belt so its easy to over tension because when you over tension it it flips over while its running. So while car is running snug it until it flips over then back off just enough til it flips back and its perfect. (handy when you don't have a FERRARI tensiometer tool.

The other (cheaper) method is to determine which GM model it was used on and go to the "Pick a Parts" junkyard and get used ones dirt cheap, pick up a couple typically they work or they don't. You can usually find one that's clean enough to blend right in.