| Author | Message | ||
| Robert W. Garven Jr. (Robertgarven)
Junior Member Username: Robertgarven Post Number: 92 Registered: 2-2002 |
my 75 gt had all steel original pulleys I have been using the same belt ric posted for 8 years no problems. my guess is that this is where you do not want to skimp on bargains for the belts or bearings, i played with my last set that came off and they explode pretty easy so make sure you press them on carefully! | ||
| Verell Boaen (Verell)
Member Username: Verell Post Number: 470 Registered: 5-2001 |
Peter, Thanx for the pix. You're right, our tensioners are made differently. Might be interesting to take a press to an old Superformance tensioner to see how it's really made. Looks like it could be a ring with a rolled-over inner edge pressed into the outer ring. Both my old & new tensioners were made by SKF. Bought the new ones from George Evans in an eBAY auction. The complete SKF tensioner bearing ass'y P/N is: SKF#: VKM 22380 When you take a close look at the side of the bearing's inner race, it's marked: SKF 617546A ITALY The 3 groups of letters are equidistant around the race. NOT ALL QVs HAVE METAL PULLEYS BTW, some of the early QVs (ie: mine s/n 43825) have the plastic cam pulleys. | ||
| '75 308 GT4 (Peter)
Intermediate Member Username: Peter Post Number: 2339 Registered: 12-2000 |
Magoo: "...It has been some time and my recollection was the timing belt Tensioner bearings that Peter had a problem with." No! It was the A/C belt tensioner bearings and it was my fault they failed as I installed an inappropriate grade... | ||
| magoo (Magoo)
Advanced Member Username: Magoo Post Number: 3934 Registered: 2-2001 |
Sorry for the confusion on the bearings. It has been some time and my recollection was the timing belt Tensioner bearings that Peter had a problem with. | ||
| '75 308 GT4 (Peter)
Intermediate Member Username: Peter Post Number: 2338 Registered: 12-2000 |
Verell, if you notice right next to the orange bearing seal, there's the lip which gradually rolls over the edge to retain the bearing. That lip looks like it was turned with the pulley, then once the bearings were in place, a press would've squeezed that lip down. Like I've said, these were from Superformance. He normally has outside manufacturers make his parts for him, so this may be different than what you have.  P.S. The tensioning arms/mounts are original, these did not come with the pulleys | ||
| Verell Boaen (Verell)
Member Username: Verell Post Number: 468 Registered: 5-2001 |
Hmm, re:"They are held in by a lip that's machined into the pulley/roller." Any chance you could post a photo? Both my old & new bearings are retained by an 'L' shaped ring that's pressed into the outer ring. Look pretty easy to press the old bearings out, new ones in, & re-use the ring. The cost is in the tensioner ass'y. Last time I looked, a pair of tensioners was something like $220-$240. Rebuilding them for $24 in parts is a clear win. A pair of belts is only $19 or so from most suppliers. (BTW, Gates also makes the belt, came across it in one of their catalogs a while back.) | ||
| david handa (Davehanda)
Member Username: Davehanda Post Number: 408 Registered: 5-2001 |
When I bought my 78 308 GTS in 1999, it had 15k miles and the ORIGINAL belts still on the car! I have them somewhere, I think they were Pirelli too. I promptly had a major done, along with all the coolant and fuel hoses replaced. | ||
| V.Z. (Ama328)
Junior Member Username: Ama328 Post Number: 63 Registered: 11-2002 |
oh, Peter, got it, thx...say, i noticed he's got a blurb there about an aluminum timing belt pulley...any experience using these ? | ||
| '75 308 GT4 (Peter)
Intermediate Member Username: Peter Post Number: 2336 Registered: 12-2000 |
Check out his webpage: http://www.nicksforzaferrari.com/forzaferrariwebsite1002.htm | ||
| V.Z. (Ama328)
Junior Member Username: Ama328 Post Number: 62 Registered: 11-2002 |
Peter, offhand, do have a ballpark price on Nick's tensioners ? Cheap/affordable/expensive? | ||
| '75 308 GT4 (Peter)
Intermediate Member Username: Peter Post Number: 2334 Registered: 12-2000 |
Also, in regards to the manufacturers of belts: I've currently got Dayco's on mine, but the last ones were Pirelli's and judging by a lack of records of a belt change, looks like they were on there for 12 years... I'd never recommend going that long on them, but by the looks of it, they suffered no apparent damage by using them for that long. | ||
| '75 308 GT4 (Peter)
Intermediate Member Username: Peter Post Number: 2333 Registered: 12-2000 |
Magoo, I was refering to the A/C tensioner bearings, not the timing belt tensioners. When I replaced my timing belt tensioners, I replaced the assembly (pulley, or more appropriately the roller plus the bearings). The ones I bought were from Superformance and those ones you cannot replace the bearings. They are held in by a lip that's machined into the pulley/roller. Nick's tensioners are pretty cool. Machined aluminum with bearings held in by internal clips. Only need to replace the bearings... | ||
| Steve (Steve)
Junior Member Username: Steve Post Number: 250 Registered: 2-2001 |
Ric , thanks. Looks like Dayco is the way I'm going to go.I do have the plastic pulleys. By the way have you used the twin cam locking tool that prevents the cams from moving after you remove the belt. Use this instead of the match cover under the bearing cap trick.I would assume that this would have no effect on the plastic pulleys. | ||
| Paul Newman (Newman)
Member Username: Newman Post Number: 961 Registered: 12-2001 |
I would be concerned about compromising the tensioner pulley by pressing bearings in and out of it resulting in a pulley coming off of the new bearing. Could be a costly experiment. | ||
| Paul Newman (Newman)
Member Username: Newman Post Number: 959 Registered: 12-2001 |
interesting ric, I have 3 plastic gears and one steel one. now what? Its been that way for eons on my car. I assumed it wouldnt matter, steel or plastic for the belts. | ||
| Greg Rodgers (Joechristmas)
Member Username: Joechristmas Post Number: 561 Registered: 3-2001 |
Good idea on the bearing assembly. I would prefer the Dayco/Pirelli. I think that Dayco is what Nick sells. I received a set of TRW belts from T. Rutlands. My father worked for TRW and was never to fond of their products. I have them on my 78' 308 right now and they seem fine but I would go for something else next time. If you need some pics I have them of the bearing assembly, belts, you name it. HTHs. | ||
| Ric Rainbolt (Ricrain)
Member Username: Ricrain Post Number: 339 Registered: 2-2002 |
Here's what the label on a 308 carb and 308i timing belt looks like. This belt works with the fiberglass pulleys, not the full metal ones used on later cars.  | ||
| Steve (Steve)
Junior Member Username: Steve Post Number: 249 Registered: 2-2001 |
So Greg do you have a preference on which manufacture you would choose to buy the belts from? I guess I would like to see what Nick or Norwood sells.Magoo even though it is less expensive to just do the bearing replacement I think I'll opt for buying the assemble as you suggest. | ||
| Greg Rodgers (Joechristmas)
Member Username: Joechristmas Post Number: 560 Registered: 3-2001 |
I have the part # on the bearings if you need them. | ||
| magoo (Magoo)
Advanced Member Username: Magoo Post Number: 3925 Registered: 2-2001 |
Tensioner bearings rebuild. This sparks a thought of a post we had not too long ago from Peter GT4 I believe. There was some discussion about using the correct bearing that was designed to be used there. I think I remember the wrong bearing had a tendency to lock up. Peter, If you are out there, comments please. | ||
| Greg Rodgers (Joechristmas)
Member Username: Joechristmas Post Number: 558 Registered: 3-2001 |
Dayco, Pirelli, TRW all make 308 belts. They are all about the same quality wise. Always replace your tensioner bearings when the belts are being changed. You can get the SKF bearings at a bearing shop for about $24 but they need to be pressed out and then you keep the round gold part that touches the belt. I chose to replace the entire assembly.(assembly meaning bearing and gold circle that bearing sits in) | ||
| Tom Bakowsky (Tbakowsky)
Junior Member Username: Tbakowsky Post Number: 118 Registered: 9-2002 |
Dayco makes 308 timing belts for Ferrari. I imagine you could just go to you local parts jobber and order a set for half the price Ferrari charges. As far as the bearing go they are available in the aftermarket through bearing supply houses. Just take your original bearing to them tell them what it's for and they can match it up. I beleive the bearing is an S.K.F number | ||
| Paul Newman (Newman)
Member Username: Newman Post Number: 956 Registered: 12-2001 |
I use the factory belts but if I knew of a better one I would use it for sure. The factory ones might be the worst, who knows? Im told you do the tensioner pulley replacement when you do the belts. I suspect an aftermarket pulley and bearing would allow you to reuse them because they would never fail like the factory ones do. | ||
| Steve (Steve)
Junior Member Username: Steve Post Number: 242 Registered: 2-2001 |
OK now that we went through the water pump issues I need to turn to the timing belts.1st are all 308 timing belts the same? Are they all manufactured by the same company? If not who makes the best quality belts? Where is the best place to buy them from (price)? Is there a different belt used on the aluminum pulleys vs. the earlier plastic ones? How do you "test" the tensioner assembly to verify it is working properly?Just want to get a little education here. Is it better to replace the tension bearing or the bearing assembly? Is it worth the cost to put in the Nick aluminum tensioner bearing assembly if you just have a street car? Thanks , you folks are great for information. |