Home » Public Forums » GMCnet » [GMCnet] new vibration on acceleration (after steering pump swap)
| [GMCnet] new vibration on acceleration (after steering pump swap) [message #320004] |
Wed, 05 July 2017 10:41  |
Ek_Lektro
Messages: 167
Registered: March 2011
Karma: 2
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As we near the hopeful end of the Eleganza’s “to do list”,
I just had my leaking power steering pump swapped out, and now there’s a vibration when i accelerate, from 0 to 20MPH and then goes away.
From the driver’s seat perspective, it seems like its coming from the steering gearbox itself, and is a bit more pronounced when taking sharp turns, in a parking lot, and even happens in reverse.
I got the pump from OReillys and rented a pulley-puller from Autozone, but must confess I was a bit distracted during this job (while other mechanics were doing bodywork outside the coach at the same time), and so i wasn’t able to watch the work while they were doing it. At first, the pulley wasn’t very straight on the pump, but then they reseated it perfect.
So what are the suspects? Bad pump? loose pump? ….?
I should also mention that i had new seals put in the steering box a month ago (was leaking off the top seal)
and the system seemed to be doing fine after that, other than the steering pump leak, which itself became more leaky after fixing the steering box leak!
Definitely didn’t have this noise/vibration issue before the pump swap, so i really don’t think its a coincidence.
At times it really shakes the front of the coach.
Standing by for experienced advice, my esteemed GMC gurus!
Cheers,
Greg
Tijuana to LA to Boston (flight) and back to LA tomorrow
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| Re: [GMCnet] new vibration on acceleration (after steering pump swap) [message #320013 is a reply to message #320004] |
Wed, 05 July 2017 13:08  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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It sounds as if the new pump isn't delivering sufficient presure/volume, and the pump pulses are shaking things. Maybe Alex or somebody knows how to test for this...
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] new vibration on acceleration (after steering [message #320048 is a reply to message #320004] |
Wed, 05 July 2017 23:19 |
Ek_Lektro
Messages: 167
Registered: March 2011
Karma: 2
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Thanks for your suggestions, everybody.
> Does it only vibrate when you are in motion or does it also vibrate parked reving the motor?
hey Roy, it seems to vibrate only very slightly when parked and revving, but its 5 times stronger when driving, under load, and most especially noticeable when starting from full stop.
Hal, I did already clean the wiper motor filter, a few weeks ago, when we did the steering box.
and Wayne, we definitely bled the system fully. (starting to get a bit experienced with that, with both the coaches)
Starting to wonder if Johnny’s suspicion of a bad pump might be the case.
> It sounds as if the new pump isn't delivering sufficient presure/volume, and the pump pulses are shaking things. Maybe Alex or somebody knows how to
> test for this...
> —johnny
I’m not home right now to do any further testing, but will be on Friday…
Looking forward to solving it,
Thanks again, all!
Greg
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| Re: [GMCnet] new vibration on acceleration (after steering pump swap) [message #320110 is a reply to message #320004] |
Fri, 07 July 2017 15:00 |
Ek_Lektro
Messages: 167
Registered: March 2011
Karma: 2
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> If you buy the beer, I will tell you the rest of the lengthy story.
OK cool Matt,
Would Amazon drop ship some beer? Perhaps by drone?
> I suggest that you eyeball the PS sheave and be sure it is not bent.
by “sheave”, you mean pulley, on the pump itself?
Yeah, when they put in the new pump, at first the pulley was slightly crooked.
I thought that this might be the source of the vibration problem,
so i came back and they loosened the belts and straightened
the pulley to 100%, but still the vibration / noise. no change at all.
The vibration can shake the whole front of the cab, and is hard to pinpoint the source (while driving),
but the noise does seem like it coming from the steering box more than the steering pump.
I should mention again, the box was rebuilt last month… just new seals basically.
And THEN, with a tight steering box, the steering pump leak got significantly worse.
So i was advised to try some stop-leak.
I asked if that might harm the new seals in the steering box, and was told No.
Asked a 2nd opinion, different mechanic… was told it shouldn’t be a problem.
Well,. maybe the stop-leak DID ruin some internal seal in the freshly rebuilt box?
I hate to think, but must speculate…
(and f that’s the case, then i’d be accepting beer donations to drown my misery.. and i don’t even drink.)
anyway Matt, I’ve got Prime
(if Amazon has beer)… and you care to tell your story;
Standing by :)
cheers!
Greg
> Under the universal heading of Been There - Done That....
> I suggest that you eyeball the PS sheave and be sure it is not bent.
>
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| Re: [GMCnet] new vibration on acceleration (after steering pump swap) [message #320344 is a reply to message #320004] |
Wed, 12 July 2017 17:16 |
Ek_Lektro
Messages: 167
Registered: March 2011
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Hey, i’m happy to report that i found the cause of the vibration. It was the fan clutch, and my suspicion is that the Autozone Duralast 22045 (replacement for 2747) apparently didn’t come with the right sized spool (not the right length/depth); and while i was busy overseeing the steering pump swap, as well as the bodywork and paint job(!), the other mechanic put the fan clutch in without analyzing the spool difference. During troubleshooting, i couldn’t really “see” the fan clutch spinning out of alignment, but when it ended up failing (and staying on constantly), suddenly it all made sense. So i got a Hayden 2747 from OReilly’s, and now the vibration is gone!
> Beside bleeding, which is a common problem on those, have you closely looked at every inch of the belt on the V side of it?
.. which brings up another issue, perhaps regarding pump bleeding. after installation, we did the ole turn hard right / turn hard left, add fluid, repeat… bleeding… and i could’ve sworn that i checked the hydraulic wipers, and they were working fine (but not 100% sure). but anyway, i’ve driven about 160 miles since the swap was done, and now the wipers are not moving at all. But the steering seems to be fine, fluid level is fine, and no noise from the gearbox. but apparently there’s either not enough pressure, or maybe the filter is blocked? This is the pump we put in: http://www.oreillyauto.com/site/c/detail/MPPC/7322155/02869.oap?year=1975&make=Oldsmobile&model=98&vi=1215694&ck=Search_02869_1215694_ -1&pt=02869&ppt=C0031
Well, the fun never ends, especially in Tijuana garages,
but where else can you get substantial bodywork and paint done in 3 days,
while they also work on the mechanical stuff…. and all for $750? (with me working alongside them)… https://www.instagram.com/p/BWEeHo5hRxn/?taken-by=solarsonic
Yep, its one of those 20 MPH paint-jobs… and the subject for a whole other post!
cheers all,
Greg
SolarSonic, back in the USA…
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| [GMCnet] new Duralast fan clutches (avoid at all costs) [message #320553 is a reply to message #320344] |
Sun, 16 July 2017 15:51 |
Ek_Lektro
Messages: 167
Registered: March 2011
Karma: 2
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Progress report: So far, the Hayden 2747 has been working perfectly, coming on when expected, with none of this strange activation ‘after' cresting a hill (like the Duralast / AutoZone fan clutches all seem to do). Rather, it turns on while you’re climbing the hill… cools as it should. Quite happy with it so far. Autozone might be fine for other parts, but after changing fan clutches 4 times in the past 3 months (between the 2 coaches), i will never go back to Duralast again! And the Hayden at Oreilley's was actually a few bucks cheaper (and also has lifetime warranty)
Hopefully this saves somebody else the hassle when deliberating which brand to go with. When you see the Hayden 2747 (or other trusted brand) on the GMCI Parts Interchange list, don’t make the mistake of having AutoZone cross reference to their 22045! Your mileage may vary, but in this case i doubt it :)
cheers!
Greg / SolarSonic / Los Angeles
> Hey, i’m happy to report that i found the cause of the vibration. It was the fan clutch, and my suspicion is that the Autozone Duralast 22045 (replacement for 2747) apparently didn’t come with the right sized spool!
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