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My smog pump seems to have some bearing noise. I have been back through the various delete or not threads and I think I would like to keep it fitted.
There was one thread where someone gave the bearing part number and they seem very cheap.
Has anyone done this bearing replacement?
Easy to do? Any other potential issues?
I would probably just go for a reconditioned pump but don’t seem to be available in the UK.
If the bearing is failing/ has failed then metallic particles are being fed into the air intake, bi passing the air filter.
You don't need it. Get some significant weight off the car. -- deletion is easiest when cam belt of similar is being serviced. meanwhile, you could just cut the drive belt.
If the bearing is failing/ has failed then metallic particles are being fed into the air intake, bi passing the air filter.
You don't need it. Get some significant weight off the car. -- deletion is easiest when cam belt of similar is being serviced. meanwhile, you could just cut the drive belt.
Thanks for the reply. Sounds like delete is the way to go then.
Unfortunately can’t just cut the belt on an 83 as the belt also runs the fan.
I have found a ‘delete kit’ online in Europe which has some longer bolts and spacers as the 2 pulleys are not quite inline and a new shorter belt but at £50 plus postage and vat it’s a lot so will look into other routes.
If I leave the pump in situ for now can I just leave the pipework as it is until I do other more involved work and then source pipe blanks?
cheers
Cliff
I took the whole system out and plugged the heads with original short hexbolts. My pump was making a horrible squeelling noise. Did make the engineroom less cluttered and more serviceable. You can also buy a short belt between the crank and fan pulley. Look at my pictures, search for those numbers and you will find a suitable belt. You just put it on the pulleys, strecht it a bit and then work the fan-bracket bolts on. Fits perfectly.
I took the whole system out and plugged the heads with original short hexbolts. My pump was making a horrible squeelling noise. Did make the engineroom less cluttered and more serviceable. You can also buy a short belt between the crank and fan pulley. Look at my pictures, search for those numbers and you will find a suitable belt. You just put it on the pulleys, strecht it a bit and then work the fan-bracket bolts on. Fits perfectly.
Many thanks, I think I will just do the belt for now then remove everything else the next time the TB is done (was only done in March)
Has yours been ok with the 2 pulleys being very slightly out of line?
Many thanks, I think I will just do the belt for now then remove everything else the next time the TB is done (was only done in March)
Has yours been ok with the 2 pulleys being very slightly out of line?
I don't think you have seen the difference between my delete and that one using the other "delete-kit". I have only removed the smogpump and put a shorter belt on between the crank and fan pulley, nothing is out of line. The kit you are referring to are using the powersteering-pump pulley. The fan then needs spacers and a longer belt in order to fit in the same configuration as the crank and steeringpump-pulley. If you want to save the original configuration there are two ways I see possible. Search for the "idler pulley bracket" for the 928. Mostly sold out but you can get lucky and find one. Or go the most original-look way = dismantle and make an idler pulley of your old pump.
I don't think you have seen the difference between my delete and that one using the other "delete-kit". I have only removed the smogpump and put a shorter belt on between the crank and fan pulley, nothing is out of line. The kit you are referring to are using the powersteering-pump pulley. The fan then needs spacers and a longer belt in order to fit in the same configuration as the crank and steeringpump-pulley. If you want to save the original configuration there are two ways I see possible. Search for the "idler pulley bracket" for the 928. Mostly sold out but you can get lucky and find one. Or go the most original-look way = dismantle and make an idler pulley of your old pump.
Ah yes sorry, I was second guessing the length of the kit belt, the picture looked like a short belt and I only had a quick look at the car this evening (just as a heavy rain storm started) and convinced myself it was slightly out of line.
I will get the short belt ordered and popped on.
Many thanks once again!
The bearings are cheap.
There are some tricks to rebuild it correctly. There are also some pieces internally which you need to be very careful with, as they are not readily available.
The air pump counteracts the belt tension from the alternator, to a certain degree.
Note that in 1980, US cars had no air pump, but Porsche added a pully where the air pump sits, to keep some "counterload" on the crankshaft.
Therefore, there will be some additional wear on the main bearings, without the air pump.
Time will tell if this is significant or not,
but on an early car with the "lower load" alternator belt, this will probably not be significant.
The bearings are cheap.
There are some tricks to rebuild it correctly. There are also some pieces internally which you need to be very careful with, as they are not readily available.
The air pump counteracts the belt tension from the alternator, to a certain degree.
Note that in 1980, US cars had no air pump, but Porsche added a pully where the air pump sits, to keep some "counterload" on the crankshaft.
Therefore, there will be some additional wear on the main bearings, without the air pump.
Time will tell if this is significant or not,
but on an early car with the "lower load" alternator belt, this will probably not be significant.
Just to easy my curiosity since you brought this subject up:
In normal setup you have 4 belts belts acting somewhat against each other. 1 left/upwards steering pump, 1 left downwards Alternator, 1 right/more upwards force Smogpump/fan and 1 right downwards AC pump. All reasonable good but you also have the fifth belt to cam and waterpump. This belt has a left/upwards counterforce on the crank. Wouldn't we always have a sideload in this configuration? With your experience, have you seen any long term effects from this?
The bearings are cheap.
There are some tricks to rebuild it correctly. There are also some pieces internally which you need to be very careful with, as they are not readily available.
The air pump counteracts the belt tension from the alternator, to a certain degree.
Note that in 1980, US cars had no air pump, but Porsche added a pully where the air pump sits, to keep some "counterload" on the crankshaft.
Therefore, there will be some additional wear on the main bearings, without the air pump.
Time will tell if this is significant or not,
but on an early car with the "lower load" alternator belt, this will probably not be significant.
Hi Greg,
Do you have part numbers for the bearings?
Thanks.
Otherwise:
I understand this pump 'doesn't do anything' but I still want in fitted. If for no other reason than to make the tailpipe "in spec". Yes, I removed the headers and re-installed the cat.
07-08-2023, 03:37 AM
83 smog pump bearing noise.
