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I have a GM 305 motor that makes a loud clatter noise at ...

Sent to Car Experts July 20 10:32 PM

I have a GM 305 motor that makes a loud clatter at highway speeds,?

 

Optional Information:
1986 General Motors

Already Tried:
Infant stages actually.I took a sound probe to try and locate at an idle.It gets real loud on freeway and qiets down at normal driving?

Customer (name blocked for privacy)
Status:  Closed   Value: $15
Answer
July 20 11:05 PM (33 minutes and 4 seconds later)
         
ACCEPTEDCheck Mark

Hello there,

I'm thinking the rocker arms are talking to ya...if it's more of a top end click/clatter type of noise that increases with rpms, they could probably stand to be adjusted.

There is a possibility the oil pressure is low, but it sounds more along the lines of an adjustment.

As long as it's not a lower end knocking type noise, that would indicate something more serious.

 

.


If you have further questions on this, please feel free to reply.

 

Thanks for asking!

 



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Virtual Wrench -- ASE Master Tech . -- 99% Positive Feedback on 1980 Car Accepts
A.S.E. 30 years/Master Tech. Foreign and Domestic
Reply
July 20 11:11 PM (5 minutes and 47 seconds later)
         
Reply to Virtual Wrench's Post: is there a possibility that a lifter could be collapsing at high rpm,Checked rockers,The sound seems to be definitely on top,but you can faintly hear it from oil pan,loud on top
Customer (name blocked for privacy)
Answer
July 21 3:38 PM (16 hours and 26 minutes and 57 seconds later)
         
REPLIEDCheck Mark

Sorry for the delay,

It is possible, but 99% of the time it can be adjusted out.

Best of luck!



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Virtual Wrench -- ASE Master Tech . -- 99% Positive Feedback on 1980 Car Accepts
A.S.E. 30 years/Master Tech. Foreign and Domestic
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July 22 3:20 AM (11 hours and 42 minutes and 10 seconds later)
         
Reply to Virtual Wrench's Post: Sorry for the time lapse.Well I did investigating myself and was given bad info.I found the problem and you were veryvery close,I had ask him to check all rockers for play and unusual anything.He said he did.He did not the problem was the # 8 cylinder valve had lost a keeper and dropped,and bent.This is the funny part,he is driving it on 7 cylinders being stubborn because I found out he told a story.Sorry did not mean to waste your time.I am extremely good at the diagnostic field and just
couldn't find the time.The major mistake was not following the prime rule never trust anyone,start from the beginging.I have learned that lesson ,well I can't count that high.I have about 28 years under my belt,I now do building maintenance.My speciality was computer diagnostic and electrical.Thank you for your help.
Howard odum Was 1 test away from master tech,oh well I still have good knowledge,and friends like you to help.Thanks again
Customer (name blocked for privacy)
Answer
July 22 9:12 AM (5 hours and 52 minutes and 25 seconds later)
         
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Virtual Wrench -- ASE Master Tech . -- 99% Positive Feedback on 1980 Car Accepts
A.S.E. 30 years/Master Tech. Foreign and Domestic
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