Technical Tips > Post 84

AIR pump – can I borrow/buy

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Vette Obsessed:
I hope you are right AusRs (so we can stop spending US$160 on air pump eliminator kits) but I don't know if that setup will work on 85-91 C4's.

The layout indicated in the diagram in your link (while similar) is different to the accesory layout on 85-91 C4's.  I really don't know if you can eliminate the air pump pulley on an 85-91 C4 and use a shorter belt without having the belt foul on something.

Ausrs:
do a search on thirdgen.org under re routing serpentine belt
there are many threads on the subject and yes there was 2 different belt routings on camaro,s as well both of which can be modded to remove the air pump
hope that helps
btw i am positive the brackets from an f body serpentine and a vette are the same brackets

Ausrs:
Many a time I have wondered how to get rid of the smog pump on my serpentine belt equipped car. Not only is it a parasitic device on the engines power output but it also adds weight and clutters up the engine bay. After experimenting with modifying the balancer and different length belts I realised it was just about impossible using the stock belt routing. I was made aware of the best way to remove it on our tech board by those who have done it.
Remember, removing emmisions equiptment is only for those who undergo no emmisions testing or whos vehicles are for racing only.

Its very simple really, the whole trick lies in the belt routing. The stock setup in a clockwise manner: Tensioner, over the alternator, down to the power steering pump, under the crank, under and over the water pump, back to the ac compressor. The problem in just removing the pump with this belt routing is that the tensioner will interfere with the belt coming off of the water pump to the AC compressor.

To remedy the situation a different belt routing is neccesary. Clockwise instead of having the belt coming off of the power steering pump going to the bottom of the crank, have it come up over the top of the water pump, back under the waterpump then around the crank and off the bottom of the crank to the AC compressor. All of your accessories will turn as they did, and you will be able to remove the polution pump. If this all sounds A little confusing, look at the picture below. Courtesy of MadMax

You will however need a longer belt, I used Dayco 968K6 belt. It is basically a 96.8" 6 rib belt. All parts stores stock just about every length of belt in every width. They should be able to find it using these numbers. If you have an underdrive pully you will need Dayco pn# 935K6 which is actually shorter than the stock belt by one inch.


note this does not show power steering pump refer back to the diagram
edit
found the belt size
it is a gates micro v 6pk2455(on the front of pack
written on the side
k060966
purchased from the local bearing supply company

Stingraynut:
….so far, 58 views !!! I was beginning to think there was just 4 or 5 people on this forum – come on vetteaholics, choose a cool username and join in, it’s easy as –

Aus Rs. Thank’s for the diagram, much appreciated - I’ll check mine tomorrow, to see how similar they are – I know that my tensioner is lower down,  between the AC and the crank.

While I was asking you, you were typing a reply…Hmmm Psychic ? the question was -Do you know the length of your belt and was it available here in Aus ? Ok, as I said,  I’ll check mine out, I’ll dig out a simialr diagram – as I said my tensioner is different but from you pic it is in a BETTER place…. I’ll get back to you.

I’ll be removing my pump on Sunday arvo, to send down to Brisbane. I really hope that if there’s an alternative, as you suggest, of throwing the pump away and using a shorter belt, I will know all the facts and be convinced before then. Thank-you for your time and patience with me, I really appreciate all info.

Vette Obsessed, I agree, it’s very important that the angles to the pulleys are correct, etc etc – geez I wish someone had sorted this before – but I expect they have – it would be great to have a ‘Tech Tips’ area like Corvette Forum to store some Aussie info.

I’ve learnt quite a bit this year – changing rear globes, a lot about the RHD conversion, C68 climate control, how the sports seats are held together – hog rings, clips blah blah, brakes, auto trans, rear diff oil change, lights, wiring, suspension, tyres, Bose stereo, fitting aftermarket stereo, wipers, brakes, fuel injection/MAF/AIR pump, accelerator - cable and spring, making USA size rego plates, O2 sensors (currently considering fitting a heated sensor), cooling fan switches, ….OK, I’ll stop the list – that’s only the first few months, there’s so much more to know.

I’m building a website with some info, but focusing more on jobs done than how they were done. –    www.myvette.20m.com … not much there yet, I’ve got to sort the real world – AIR pump etc before I’ll have time for cyberworld.

BTW – the weather in Cairns has been perfect this week (not the weekend though) I’ve had the roof off for 3 days, got sunburnt on Tuesday with just 30 mins driving the city at lunchtime. My seats are to die for, the stereo is AWESOME – the exhaust note is subtle by growly, Oh Yeah, I am really enjoying my Corvette, it’s all I imagined - and I imagined heaps.
Also BTW  - I’ve got a digital thermometer with two probes showing me cabin and vent temps – today, the 3rd day of spring it was 35C in the cabin, driving with the roof off. I put the aircon on and the vents went down to below 20C so I had cool air blowing on me  (and everyone else at the traffic lights……I’m DETERMINED to have good aircon for the summer…….but that’s another project.

S’nut

Vette Obsessed:
AusRs, the bracketing for the accessories is different.

The tensioner on our cars is roughly where the air pump seems to be on your car.  The air pump is roughly where the alternator is and the alternator is to the right of the where it is shown in your picture.  The routing of the belt is different.

I'm not trying to knock your info.  I'd post a pic but that isn't too easy for me to do at the moment...  Just trying to help work out if there is an alternative like you suggest.

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