4.0L Underdrive Pulleys Install - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-28-2011
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4.0L Underdrive Pulleys Install

Got my Underdog Underdrive Pulleys recently, and I am going to try to install them this weekend. I purchased the whole kit... crank pulley, water pump, alternator, idler, belt, etc...
Will be replacing my belt tensioner in the process... and might even do my e-fan... if I dont' have too much trouble with the pulleys.

I bought a torque wrench... a cheap one from harbor freight.. 5-80 ft-lbs because I'm pretty sure I will need it for the crank pulley?

And I'm not paying $85 to rent the tool to help remove my fan.. unless it's just impossible to get off otherwise... I have big adjustable wrenches.. that should work.

Any other things I am not thinking of? Anybody else with a 4.0 that has done this that has any tips/advice or horror stories they can share so I can avoid a huge PITA and get this done quickly? I think aside from the crank pulley, all the other ones seem pretty simple?
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Old 01-28-2011
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Guess I should have read the instructions, haha. Looks like I will need to pick up some grease (not sure if bearing grease will work?), and I'll need some RTV sealant also before I start.

Any help is appreciated.
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Old 01-28-2011
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What is the grease and RTV sealant for?
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Old 01-28-2011
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The instructions say to apply grease to the hub of the asp dampner, bore and under the install bolt head/ washer. Apply Rtv sealant to keyway of pulley to help prevent oil leakage. Apparently i'll need a harmonic dampner removal tool as well. This is why i was asking for help, haha.
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Old 01-28-2011
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Well.. this will help a little. Google is my friend. Still open to tips and advice from people with experience tho :)

http://stuffforyourranger.com/How_To...nderdrive.html
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Old 01-28-2011
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i was able to take the fan off by using a socket and bar in the crank pulley and a wrench on the fan. was a major ***** to break free
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Old 01-28-2011
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Would it be a good idea to replace the front mail oil seal while the pulley is off or is it something that comes with the new pulley, This assembly has me somewhat confused?
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Old 01-28-2011
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Yea, I was thinking it couldn't hurt to replace the seal while I was in there... I just read this thread on another forum...

http://www.********************/4-0-...-help-fix.html

^ that is from FRF... ford ranger forum... this forum has a block on that for some reason. But good info and good pics

Last edited by RLong31; 01-28-2011 at 11:01 PM. Reason: stupid block on link...
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Old 01-29-2011
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What is the link to that?
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Old 01-29-2011
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your gonna need a big *** pair of channel locks to get the fan off, the wrench is something like 32mm. so if you can find something that big, you should be good.
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Old 01-29-2011
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I have a pair of 12 inch and a pair of 16 inch channel locks... So hopefully that will work, i dont have $85 to throw down for a deposit on the fan clutch tool rental until i get paid, and i wanna get this done
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Old 01-29-2011
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Quote:
Originally Posted by fishy2k8 View Post
What is the link to that?
Its ford ranger forum.com

Put that in where the * are
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Old 01-29-2011
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like i said. you dont need any special tool. socket and ratchet to hold the crank and an adjustable wrench on the fan
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Old 01-29-2011
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A little update, thankfully Scott (Dixie_boysles) gave me some advice, and I found out that you need a new bolt for the crankshaft pulley when you take it out... it's a torque to yield bolt. So I did not get it it taken out, because Ford dealership had already closed and won't open again until monday and I didn't want to be stranded.

I also broke my crankshaft positioning sensor... so I get to buy a new one of those as well. Also, the replacement idler pulley had a bit of a snag.. but I figured it out, had to remove a washer. So, the only things I got on there today were the replacement stock sized idler pulley, replacement stock-sized top water pump pulley (3 bolts), and a new belt tensioner.

I broke down and rented the fan clutch removal tool... and that made things a LOT easier. I tried to get the crankshaft bolt out at first, but stopped when I found out I needed to replace it. But... it's 19mm, not 18 like the directions say.

I will be doing a How-to on this, because it's a huge pain in the a$$ and I have had a hard time finding good information to go off of, and the stuff I did find was vague and lacked pictures or videos. Hopefully it will make it easier for the next person that tries to do this mod.
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Old 01-29-2011
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Something to add... and I'm hoping someone with experience with the crankshaft pulley will chime in... but in the center of my crank pulley, where the center bolt is... there is a loose piece inside, feels like a metal circle. Any idea what that is, what purpose it serves... is my pulley broke? Doesn't make too much of a difference seeing as it's getting replaced, but I'm just curious.
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Old 01-29-2011
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There's a washer that goes behind the crank bolt, could be that.
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Old 01-29-2011
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Hmm, I never got the crank bolt loose... It feels like a short metal pipe.. it's feels about an inch long... and the diameter matches that of the opening on the crank pulley itself, except it's inside of it, just wiggling around free inside there. I have read where the harmonic balancer can seperate from the pulley on 4.0's... maybe that's what is happening and it needed to be replaced soon anyway?
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Old 01-30-2011
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curious to see if the gains are worth the money.
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Old 01-30-2011
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ditto, i hinted i want this for my birthday.
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Old 01-30-2011
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If I can get 1-2 mpgs and feel just a little pep I think it will be well worth it. Will soon be doing an e-fan too, so we'll see.
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Old 01-30-2011
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Quote:
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curious to see if the gains are worth the money.
x2
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Old 01-30-2011
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I have to pick up the crank bolt from the stealership monday and then get a crankshaft front seal from autozone because pep boys has to special order it?

I dont know if i will try to finish it this week or if i will wait until friday to try again. I think my best option to loosen the crank bolt is to "bump" the starter, and i need to buy some pipe for breaker bar.

My impact wont fit in such a small place. It will be a minute before i have any results to post for gains and i wont have dyno proven statistics, so dont get ur hopes up.
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Old 02-01-2011
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Please do write a how to. I have an underdrive pulley sitting in my basement, just not the time or knowledge to put it in. Hopefully it works out for ya!
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Old 02-05-2011
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Please do write a how to. I have an underdrive pulley sitting in my basement, just not the time or knowledge to put it in. Hopefully it works out for ya!
x2
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Old 02-05-2011
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Working on it now... Taking lots of pictures and takin notes. And all the f'in pain in the a$$ issues i'm running into will be documented to make it easier for anybody trying to do this after me.
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