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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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distributor noise
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Topic: distributor noise (Read 7626 times)
the_legend_1981
Frequent Member
Posts: 288
distributor noise
«
on:
March 13, 2009, 05:07:23 pm »
i'm not having luck lately...now i have a grinding noise under my distributor cap...what could it be?
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VileZambonie
Global Moderator
Senior Member
Posts: 19182
Re: distributor noise
«
Reply #1 on:
March 13, 2009, 05:42:31 pm »
Is the cap and rotor installed correctly? It's only two screws so pop it off and check
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74 GMC
,
75 K5
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84 GMC
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86 k20
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79 K10
the_legend_1981
Frequent Member
Posts: 288
Re: distributor noise
«
Reply #2 on:
March 13, 2009, 05:45:20 pm »
yeah i tried that about 6 times...it looks as if its hitting on the middle piece that comes down off the cap...i tried the old rotor too
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Lt.Del
Andy aka:SgtDel
Senior Member
Posts: 3864
DelbridgePhotography.com
Re: distributor noise
«
Reply #3 on:
March 13, 2009, 08:27:42 pm »
HEI?
Ensure all four spring clips are attached correctly so the cap won't be !@#$-eyed. Did the little square doomajiggy fit correctly in the square indention?---i usually try to turn the cap after fitting the sqare lock into place to ensure correct placement.
If everything like that is lined up, you should remove the cap and have someone turn the key and visually (and audibly) check to see if grinding noise happens when cap is off and try to diagnose that way. The distributor shaft could be bent, but i believe that is rare.
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Irish_Alley
Tim
Senior Member
Posts: 13333
Family is not an important thing. It's everything.
Re: distributor noise
«
Reply #4 on:
March 14, 2009, 12:51:57 am »
when you said it looks like its hitting the middle piece, you mean the middle plastic piece right? but like Sgt said make sure its seated right sometimes it may seam that way but it ain't. did you do a tune up then this noise accrued or just out of the blue?
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
the_legend_1981
Frequent Member
Posts: 288
Re: distributor noise
«
Reply #5 on:
March 14, 2009, 06:54:27 am »
yes it hits on the plastic piece. that's why i'm thinking that the cap is on wrong. the clips go right down into the slots correct. i've done it before and have not had a problem.
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Irish_Alley
Tim
Senior Member
Posts: 13333
Family is not an important thing. It's everything.
Re: distributor noise
«
Reply #6 on:
March 14, 2009, 11:34:31 pm »
may be a stupid question but is the rotor on right. take a pic of the cap if you can. and like Sgt said try to turn it over w/o the cap i know i had a bad distributor once changed the shaft out with one i had sitting and fixed the problem
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
the_legend_1981
Frequent Member
Posts: 288
Re: distributor noise
«
Reply #7 on:
March 16, 2009, 04:27:01 pm »
yeah i check it a bunch of times, cant figure it out...the original rotor and cap i took off didnt rub. think i should try the original rotor?
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VileZambonie
Global Moderator
Senior Member
Posts: 19182
Re: distributor noise
«
Reply #8 on:
March 16, 2009, 05:48:24 pm »
post pix
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/ _ _ _\_
⌠¯¯¯¯¯' [☼===☼]
`()_);-;()_)--o--)_)
74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
the_legend_1981
Frequent Member
Posts: 288
Re: distributor noise
«
Reply #9 on:
March 16, 2009, 06:11:22 pm »
3rd one you can probably see the best. Its wearing a circular shape in it.
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VileZambonie
Global Moderator
Senior Member
Posts: 19182
Re: distributor noise
«
Reply #10 on:
March 16, 2009, 06:25:37 pm »
Did someone put the old rotor on backwards and break the tab? In other words, they installed the distributor wrong so just made the rotor fit backwards? You'll notice there's a locating tang on the pole piece.
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, ___
/ _ _ _\_
⌠¯¯¯¯¯' [☼===☼]
`()_);-;()_)--o--)_)
74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
the_legend_1981
Frequent Member
Posts: 288
Re: distributor noise
«
Reply #11 on:
March 16, 2009, 06:37:30 pm »
I dont think so...I tried putting it on backwards thinking something like that...wouldnt fit. I can take pictures of the rotor in there and the cap on tomorrow if that will help.
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ccz145a
Senior Member
Posts: 1393
Re: distributor noise
«
Reply #12 on:
March 16, 2009, 09:15:03 pm »
Does the sound go away with the old rotor in place?
I'd at least compare the 2 very closely before you take the new one back to return.
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1975 C10 Silverado LWB, 454CID, TH400, 10bolt 3.42
11MPG Downhill w/tailwind (but there ain't no hills here)
the_legend_1981
Frequent Member
Posts: 288
Re: distributor noise
«
Reply #13 on:
March 17, 2009, 02:44:14 pm »
yeah 2 different rotors make the noise.
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VileZambonie
Global Moderator
Senior Member
Posts: 19182
Re: distributor noise
«
Reply #14 on:
March 17, 2009, 05:10:13 pm »
Make sure that grommet is sitting in it's place for the module or the cap won't sit flush.
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, ___
/ _ _ _\_
⌠¯¯¯¯¯' [☼===☼]
`()_);-;()_)--o--)_)
74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
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distributor noise