A/C compressor bypass belt
 

What is the size of the belt to bypass the air compressor?

anyone????

Check out Bosch part number 6PK890, which is 890mm effective length. If you have a Napa close to you, their part number 25-060355 will work.

FYI:
I bought NAPA part number 25-060355 and it works perfectly. I had tried the 25-060365 and it will work, but does not leave much idler adjustment.

The FSM has the belt sizes with and w/o IIRC

Does bypassing A/C free up much/any HP ?

Very little if any. No proven dyno results.

The compressor when not activated acts as a idler and spins with little if no drag on the belt/motor. The only increase I felt is the in-cabin temperature.

What about the weight of the compressor, condensor, hoses, and accumulator?

All my equipment is still there, just no belt running the compressor. I bypassed because my pulley bearing started to make some noise. I'm very particular about how my car sounds and didn't feel like rebuilding the compressor pulley. I'll end pulling all the parts off when I do my 3.5 swap.

I don't mean to revive an old thread, but I just bought the 25-060355 (napa had to special order it) but the box says 920mm, not 890mm. The belt model is 6PK903. I'm thinking that this might still work, though, with a little more adjustment of the tensioner. I will try it either tomorrow or Friday and reply here.

Ok, the 6PK903 belt worked perfectly. So, for the record, if anyone winds up having to do this, a 920mm 6-groove belt will also do the trick. Horrible a/c compressor bearing noise is gone, all is good (until the summer when I have to fix the a/c:mad:). :D

it runs super quiet with a/c bypassed, i got compliments on it.

Sounds smoother too.

im getting this same awful sound from my a/c compressor the outside pully spins freely but the inside seems like its engaged all the time trying to spin. it spins once then stops then struggales to spin again 2 secs later

Has anyone that bypassed their A/C compressor had any bad experiences / problems afterward? I've done this twice, with two 4th gen maximas, and had problems. First time, shortly after installing the shorter belt, I burned up my original alternator (@~130k miles). It happened instantly after a round of spirited acceleration. I'm starting to think that maybe the alternator pulley was overstressed by the increase in contact area with the belt and also the new angle that the shaft of the alternator was now pulled towards may have caused the coils inside to short out somehow. This is all just a guess, but it's my best guess. The second time I bypassed the A/C compressor I let the noise go on and on, and one day starting my maxima, I heard a loud thump and checked outside, my outer ring of the crankshaft pulley along with the belt was shot off the car. If anyone else has had issues with this bypass, I'd really like to know. Thanks in advance.

never had an issue when I by passed, it was for about 2-3 weeks.

is it possible to get a bypass belt for 01 maxima? because i have the compressor whining and bearing broken noise?

Yes, it is.

The link you need.

Alternatively, for the search impaired:

http://forums.maxima.org/5th-generat...ator-belt.html
http://forums.maxima.org/5th-generat...belt-size.html

Rezinflux - I doubt the issues you had with your car after by-passing the A/C were caused by that mod. Our Alty's our known to crap out, and they sometimes go instantly. The outer ring of the flywheel deterioates as time goes by. It's nothing more then a rubber insulator. There have been quite a few reports of this happening, my buddies I30 had completely dried out and split as well.
If you tightened up the belt a bit to much after the mod, then yes, this could have accellerated the failures, but not caused them.

Old thread new question. I want to do the ac delete but while I'm at it I dont need the power steering either. Anyone know what belt to use. Mind you its a Vq30 but its not in a max or anything that would need ps.

evo

Use the belt shown above then just don't put the PS belt on...

Lol I just reliezed that when I was pulling the motor. And here is some automotive carnage for your veiwing pleasure.
http://img.photobucket.com/albums/v2...d/CIMG1500.jpg


evo

Sorry to dredge up an old thread but this is exactly the information that I needed for the temp A/C compressor bypass belt. NAPA's part number 25-06355 is currently displayed as NBH 2506355 on their website and a cross reference number for an equivalent Gates belt for the same application is K060355 in the event you don't have a NAPA parts house in your area.

a/c compressor bypass belt
 

Just did this past weekend. Auto Zone Duralast belt 360K6. How your read it is 360 at the beginning is 36.0 inches length, K6 is 6 ribs(grooves) which what you need to fit the grooves of the pulleys correctly. This is the perfect size, belt was ~$14. Great relief, i had a whining sound which went up and down with revs and at some point had me thinking could be timing chain, whew.

I had to do mine to, but just replaced the A/C Compressor and works really well. Very quiet and A/C cool.

Im going to do this mod this weekend. I've read before on here it may make the dfrost not work, is that true/ will the heat still work for the winter?

Also, do I need to unplug the compressor as well?

Why would you do this? Not worth it.

Either way, the defroster worked fine, since I did it in the winter, and all the windows needed was heat, not the compressor. And I never unplugged my compressor either.

When WOT, even if the AC was on, there is a relay that will shut it off. It's only minimal drag.

Compressor makes to much noise and needs replacement/doesn't work. This is temporary until I can afford a rebuilt, or new one...but I don't care for an AC to much..

Thanks.

Ahh yes .. I agree, mine is on it's way out too ... Loud!

does this bypass belt work on a 99 max?

:nod:

95-03, maybe even through 07.

thanks for the help. this is the one that worked on my 99 maxima SE:
25-060355 (35.5 inch).
the 37 inch was too loose, maybe my alt or idler pulley is a different diameter from someone who said it fit.
now that the ac is out of the loop, notice the crank pulley wobbling, wtf
this pos is killing me.

That's it! I'm gonna say it!

A/C Delete does offer it's advantages!!!! If I didn't live in TX I'd still be running w/o my A/C

Muwahahahahaha.

I got rid of mine for weight reduction. I never used it anyway. I removed the condenser and lines also.
http://carphotos.cardomain.com/ride_...169_medium.jpg

worked great I used a belt that would fit a 2.3 ford and the max purrs yet again :)

This is definitely possible. I thought I had a bad AC compressor, and was going to bypass it, and on my drive to the auto parts store, I thought about this question, and then applied what I knew about forces from a course in Statics I had taken to find out what it all means.

Basically, each side of the belt (the coming and going sides, not ribbed vs smooth) can be considered as applying a force. For any included angle (the angle between the coming and going sides of the belt) the force will equal 2F*Cos(theta/2), where theta is the included angle. So, when the Alt is only connected to the crank pulley theta=0, and force=2F. When the Alt is connected to the crank at 0deg and AC compressor at 90deg, the force applied is equal to 2F(cos(45)) or about 1.414F. This shows a 41% increase (2/1.414) in force applied to each bearing with the AC compressor removed, so... reduce how tight it is(by about 30%)! It's not going to slip anyway, almost the entire pulley is covered in belt.

I did mine when i bought i the car because the compressor seized, 6000 miles later still runs great, get a little squeal on start up when its cold

did mine with a Napa belt this worked great for me over the winter hopefully I can get the A/C fixed for the summer thanks for this thread hope others benefit from it also.

i recently just by passed my ac compressor with a new shorter belt and its running well so far. i got the part from advanced auto parts and the part id is 370k6 6pk0940.I also unplugged the electrical plug on the compressor. how long can i drive my car with the ac comp unplugged?