371 Rocket Need help

Old June 9th, 2012, 05:51 PM
  #1  
Registered User
Thread Starter
 
Join Date: Nov 2009
Posts: 53
371 Rocket Need help

I have a 57 Oldsmobile 98 with the 371 motor. Been running fine and about a week ago I got a knock coming from the motor on the driver side. It only knocks after the motor warms up. I pulled the valve covers and fired the motor and there is NO oil going to the valves on either side. I figured it must be the oil pump. Well I put a oil guage on the motor and fired it up and its reading 35psi so I know the oil pump must be working. I am clueless now. Thanks for any help you might be able to give me. Thanks again
317rcampbell is offline  
Old June 9th, 2012, 06:59 PM
  #2  
Registered User
 
Join Date: Sep 2006
Posts: 1,074
You may have a clogged oil feed hole up to the valve train which requires removing the rocker arm assembly and finding the oil hole in the cylinder head. A thin metal rod such as a heavy gauge welding wire and some degreaser would work
59-59-59 is offline  
Old June 10th, 2012, 12:41 PM
  #3  
Registered User
Thread Starter
 
Join Date: Nov 2009
Posts: 53
Thanks for your help. I removed the rocker and used some welding wire and I can get it to go down about 3 1/2 inches . The oild lookes to be very clean. is there a trick to get the wire to go farther down ?
317rcampbell is offline  
Old June 10th, 2012, 01:30 PM
  #4  
Registered User
 
Join Date: Sep 2010
Location: Shorewood, Il.
Posts: 3,057
A very small bent at the tip will help, while spinning and twisting usually gets through.
I just did a '65 400 - broken valve seals!
Rickman48 is offline  
Old June 12th, 2012, 02:09 PM
  #5  
Registered User
Thread Starter
 
Join Date: Nov 2009
Posts: 53
Well I think its the oil pump after all. when I start the car its shows about 35psi oil pressure and as I let the car idle after about 5mins it drops down to 10psi.. What do you think ?
317rcampbell is offline  
Old June 12th, 2012, 02:17 PM
  #6  
Registered User
 
Oldsmaniac's Avatar
 
Join Date: Oct 2005
Location: NJ
Posts: 5,560
For an Olds I think that is within range. You must determine if the knock is from deep within or is it a tap from a lifter or rocker. A rod knock can sometimes be pinpointed by pulling a plug wire one at a time and then rev the engine some. The noise will decrease or go away on the offending cylinder because there is no load on it from firing...
Oldsmaniac is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Aedwards
Ninety-Eight
4
November 25th, 2014 01:01 PM
1957 Super 88
Small Blocks
6
May 30th, 2013 10:47 AM
Blownolds
Parts For Sale
2
December 14th, 2012 02:00 PM
55 Post
Parts Wanted
5
May 21st, 2012 11:56 AM
J'ville
Parts Wanted
5
August 28th, 2006 05:21 PM


Thread Tools
Search this Thread
Quick Reply: 371 Rocket Need help


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.