rixter

I may have some at home, it rides farther back now, maybe a bit too far
next change out I'll replace EVERYTHING...

heinrich

Rixter, it's an organic system. There is no perfect path, and a healthy path is sometimes indistinguishable from an unhealthy one, unless one considers every component of the drive sytem. Most belts I've seen (maybe all) do not run dead-centre. And most I've seen run closer forwardot on the passenger's side. I believe this is because the tensioner is inline before the passenger cam timing gear. So, the tensioner really isn't the best design IMHO. If we could replace it with a sprung unit with constant tension, and a couple of 1-inch flanges, that may help, but the problem with springs is the recoil. Maybe an hydraulic plunger like we have, but sealed. I see many leaks and they are 99% from the silly little rearward seal. I was thinking of welding mine closed in the back to prevent oil loss. HOWEVER I must say, I have never seen one leak after I r&r'ed it.

H2

Sirens going off in my head!! That belt's too close...and a time bomb. Unfortunately, given all the work involved, particularly where you're considering a SC, you'd be way ahead to just bite the bullet and replace most moving pieces that touch the belt and save the old ones for spares. If you don't do this with a supercharger (or even without), I predict that your engine will be history not long after your update.

Thanks for keeping us posted.

Harvey

Jim_H

Here's the deal, imo. If you are going to SC it and you are anywhere close to tb/wp replacement time or something ain't looking right, tear the front of the motor down and replace everything, even the bolts. It might seem like overkill but I didn't want to be worrying about the front of the motor once I installed the SC. It is not that difficult of a job, regardless of what some might say.
I also, with the help of Ken, timed my cams. The actual timing aspect of this is a 2 man job. But once again when you know everything is timed and adjusted correctly it makes you feel much more confident when pushing over 400 rwhp.
Peace of mind is a key ingredient to enjoying a SC.

Jim R.

Listen to Jim H.!(and others) I did the same and replaced all gears, rollers, bushings, rebuilt tensioner, WP/bolts and TB prior to SC install. You want the motor as close to 100% as possible prior to adding more stress/power to it. That belt tracking is a time bomb from the pics. If skill or cost is an issue, rethink the installing the SC for now.

I also did my cam timing later, and it was well worth it.

Jim R.

Abby Normal

Some things to ponder:

Doing it right is better and cheaper than doing it over.

If you pay to do it right, you'll only cry once.

Don't be such a cheap bastard

Your going to need all of the belt you can get when I install mine.

I have a roll of handi-wipes I'll sell ya for $5.00

If you want to ride in a 928, I can pick you up....

Th Dude

Hi Charles,
Nice to see you are checking everything out and getting it all in order prior to the TS install. I did the same exact thing before my installation. It ultimately allows you to narrow down any post install issues that may arise.

I'm still "on board" on my end...just waiting for my expert to have time for the removal. He's been busy lately, but tells me he still plans to do the job.

And a big hello to the rest of Louisiana Rennlist 928 Chapter.

rixter

ok, here are some before & after pics so you don't have to go to the previous thread
as Ernest noted in the other thread, it seems as though the stripped bolts on the idler arm allowed the belt to ride forward because they weren't tightened properly
the belt actually rides a hair back from center now on the cam gear, but is dead center on the idler
the belt and pump had about 1000 miles on them and I can only assume this was a short term issue as there was not significant wear on the cam cover (though some rubbing was evident)
sorry for the quality of the after pics, I can get more when I do the retension

heinrich

Sweet -- thanks, looks like you did a good thing

Pizza

Thanks for all the input guys.

Abby, just drop yours off for the weekend. I'll be gentle. I have the money (me cheap bastard?) and the skill so I'm jumping on it after I finish typing this.

Derek, I hope to be ready in a couple of weeks. Thanks again!

Pizza

Timed the cams? Whats the procedure? Is it in the WSM? Website?

Thanks

Pizza

I found a few things that might have made my belt walk to the front. My tensioner was bone dry. The bearing on the roller that is mounted to the water pump has some play in it. The tensioner pivot arm bolt and plastic bushings were worn pitted and cracked. I ordered new parts. Hopefully this will solve my problem. A few questions. Should coolant come out of the bolt hole were the tensioner pivot arm attached to the water pump? Should oil come out of the hole behind the tensioner? Do I have to take my harmonic balance off to get the timing belt off or can I remove the plastic cover and get it off? See pictures.

Thanks

Pizza

Pictures

heinrich

coolant yes. oil no. Likely tensioner oil ..... no biggie. Good job, look at those ead bushings.

H2

Heinrich is right...that hole leaks fluid...the tensioner is probably just resiudal stuff...I pulled my harmonic balancer (trick to it...patience and don't give up)..and yes, your parts look way overdue for replacement. If I was going to the trouble of putting in a SC, I'd replace all the other rollers, etc. since they may be nearing the end of their reasonable life span. If you do it right this time...the next time could be the one that makes you give up 928s (if your belt parts and your engine goes). It's not worth a few hundred bucks insurance.

Harvey