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Bad Smog pump bearings? 1985 S3
I pulled the car out of the garage for the first time in a couple of months to change a light bulb (not in the car) and let it idle in the driveway. I noticed an intermittent growling sound that seemed to be coming from the passenger side of the engine bay below the battery jump post so I put on my mechanic's stethoscope and started searching, the sounds seems to be coming from a belt driven pump, I think it's the air pump. It's right next to the timing belt tensioner on the left looking from the front of the engine.
It's not constant, it sort of fades in and out. Anyone had an air pump do this? Is that about the right location for the air pump? The car has about 78K miles on it, never changed the pump as far as I can remember (which isn't saying that much since I can't remember 1986 all that well anymore :) ) I remember my daughter was born right about then... PS: I figure it's the air pump by process of elimination; it could be either the air pump or the P/S pump. The WSM shows the P/S pump under the P/S fluid reservoir but that's on the wrong side of the bay. Couldn't find any pictures of the air pump. Thanks, Scott. 1985 928 S3 Black/Black + matching parts car 1989 944 S2 White/Blue Firehawk Tribute build in progress. |
You're probably on the right track. A ailing air pump also make a guppy-like sound (I know, that doesn't mean much) but the location is diagnostic, I think.
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They go bad. I've got an air pump on my 87 that's straight up seized. Need to get some bearings from Roger and get it smogged.
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Originally Posted by Chalkboss
(Post 15028335)
They go bad. I've got an air pump on my 87 that's straight up seized. Need to get some bearings from Roger and get it smogged.
Regards, Scott. |
Originally Posted by M. Requin
(Post 15028320)
You're probably on the right track. A ailing air pump also make a guppy-like sound (I know, that doesn't mean much) but the location is diagnostic, I think.
Regards, Scott. |
If you have access to a vise, an R&R of all 6 bearings is about 2 hours plus $50 in bearings- One 6203V, one B-188, and four J-65's.
https://webfiles.uci.edu/redwards/pu...%205-11-16.jpg |
Originally Posted by Rob Edwards
(Post 15028460)
If you have access to a vise, an R&R of all 6 bearings is about 2 hours plus $50 in bearings- One 6203V, one B-188, and four J-65's.
Regards, Scott. |
Update: Today I finished installing my rebuilt air/smog pump. It was quite a bit easier to get in than I'd expected, but there are a couple of tips I learned the hard way so I'll add them here. - on the '85 it's important to attach the pressurized air line from the pump to the exhaust before installing the pump. You need to secure the hose to the pump before installing it, then secure the hose to the exhaust after the pump is installed. If you don't, you can't attach it to the pump since the hose clamp isn't reachable and you'll end up taking the pump back out. Ask me how I know this :) Well, I said 'a couple' but I was clearly mistaken. That was it. Other than that, the reinstallation went without a hitch. The bearing replacement is simple, and nothing more sophisticated than a bench vise (and patience) is required. Regards, and thanks for all the advice, |
PS: Shameless plug; I still think anyone who owns one of these cars needs to spend a nickel or two on a 944, either a turbo, or my personal favorite, the S2. You won't be disappointed and it will take your enjoyment of the 928 to a whole new level. Sincerely, |
I daily drove a 87 944 auto until the exhaust gaskets blew out last month. Believe me, it makes me appreciate how much power my 928 actually has lol.
The 944 is fun on freeway onramps and twisty roads though. You have to take them at least at 50 to have a hope of getting up to merging speeds lol. I nicknamed ours the gutless wonder. |
Originally Posted by The Forgotten On
(Post 15320644)
I daily drove a 87 944 auto until the exhaust gaskets blew out last month. Believe me, it makes me appreciate how much power my 928 actually has lol.
The 944 is fun on freeway onramps and twisty roads though. You have to take them at least at 50 to have a hope of getting up to merging speeds lol. I nicknamed ours the gutless wonder. The 928 has both power and tremendous road holding abilities, I've never personally broken it loose on dry pavement but my son spun it on exiting the Andretti hairpin at Laguna Seca a few years back when his instructor shifted it into second on the entry and didn't tell him. No real fault of the car, just someone who really didn't understand triptronic transmissions throwing a wrench into the works. I honestly prefer the S2 on the track, it's lighter and it doesn't go through brake pads as fast as a result. |
Originally Posted by Rob Edwards
(Post 15028460)
If you have access to a vise, an R&R of all 6 bearings is about 2 hours plus $50 in bearings- One 6203V, one B-188, and four J-65's.
https://webfiles.uci.edu/redwards/pu...%205-11-16.jpg |
For pulling bearings I'd recommend picking up a Harbor freight bearing puller kit. I do this all the time with electric tractor motors and it's really nice to have the right tool for the job.
As for the 944, I of course have an S and it's a fun little drive. Not as much power as the 928 but does rip all the way to redline. |
That is not an answer to my question, I would need to know the bearing references for the pump of a 87 928 S4.
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Yes, they are correct for ‘87.
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