| Author | Message | ||
| david schirmer (David)
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Interesting. I wonder if they used that design on the turbo model for better cooling. My '77 308 pump has the straight vanes. | ||
| Bernard Rowe (Gtsturbo)
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This may have already been covered in old posts but: When I rebuilt the pump, the replacement impeller was a very simple shape with straight vanes and a lot of clearance between the front housing & the rear pump casting. My original impeller had helical vanes as in the pic� & runs a close clearance to the rear casting. I decided to rebuild with the old impeller as it looks a lot more efficient than the replacement. So far my car has never had any over heating problems and will sit indefinitely with the temp never going beyond 90. I wonder if it would as efficient with the straight vane impeller?  | ||
| david schirmer (David)
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Peter, I like the solution. It is nice to know that it is possible. It is the larger id hose. I was thinking this would be a good backup. So I'm in no hurry to do this. Maybe we will hook up in Seattle or Vancouver one of these days. I'd love to check out your GT4. | ||
| '75 308 GT4 (Peter)
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David, you're in WA. right? I can fix it, but it wouldn't be to weld a hose barb to it. I would fill up the hole, re-drill and tap (to a more common pipe-taper thread). Just screw in a new hose barb and presto. Which hose barb is it (the small ID vent hose, or the larger overflow-tank supply hose)? That housing is still worth something (can't the 328 pump bolt to it?). | ||
| Bernard Rowe (Gtsturbo)
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I had my pump checked over by my local Ferrari technician & he gave it the �all clear�. The preload on the face seal is quite high so there is a lot of drag, much more than on other pumps I�ve rebuilt. The replacement seal was supplied by Ferrari UK, and is one piece vs a 2 piece seal that was originally installed. It seems that this is an upgrade. Hopefully it will have a longer life!! Thanks for the advice! | ||
| magoo (Magoo)
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David, as Peter GT4 says, "Anything can be welded." Epoxys won't hold and if they did I wouldn't trust it on my Ferrari. If you want to keep the pump for a back up it would be worth it. Just find the guy,welder, who can weld that housing and have him run a bead around the nipple to the housing. Don't tell him it's off your Ferrari. | ||
| david schirmer (David)
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magoo, can you really weld something to the casting? This is way out of my skill level but maybe there is someone around here that could do it. I guess I still have to wonder if it's worth the trouble though. | ||
| James Gardner (Jhg)
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Bernard, Just a thought, Make sure you have the right seal combination. Ferrari had two different types of pumps that could be mounted on that type of engine. Model year does not always indicate pump style. I've seen early 308 pumps on late model 328's. Hope it helps | ||
| magoo (Magoo)
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David, Why couldn't you have the nipple welded into the pump housing. Remove all seals etc. before welding? | ||
| david schirmer (David)
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Does anyone know if there is a way to build up the wall thickness on a 308 water pump. I have a spare pump that the threads where the hose screws in were mangled beyond belief. That is another story. --Let's just say that I would love to know what brand of epoxy they used to put the fitting in there. True! --There isn't enough wall to rethread, so I'm wondering if there are other tricks to possibly salvaging this one. The other question would be if it is even worth it. I upgraded to a 328 pump because I had heard that they were a little beefier than the 308. | ||
| Edward Gault (Irfgt)
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I would have to say that the seal is not pressed all the way in and is binding. See if it frees up when you back off the impeller nut. | ||
| Edward Salla (350hpmondial)
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Should have sent to "The flying dutchman." He does British Cra* but does enjoy working on our pretty castings. Cheeper then most too. | ||
| Bernard Rowe (Gtsturbo)
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I�ve just rebuilt the water pump on my GTS Turbo, it�s the same as a 328 with the �big bearings� & ceramic rear seal. After refitting the bearings, preload spacer, shaft & front pulley the assembly turned nicely in the housing with no free play & little drag. However after fitting the seal & impeller it now takes a considerable amount of torque to turn the shaft. There are no unusual sounds! when it turns, its just uniformly stiff the whole way round! I haven�t measured the break away torque, it just seems a lot more than on other pumps I�ve rebuilt. Any comments? |