| Author | Message | ||
     Mark D. Mathews (Mdm) New Member Username: Mdm Post Number: 17 Registered: 12-2002 |
My 89 RRC w/approx. 120k miles has developed an intermitant lifter knock. It has gotten worse over the past few months. It usually does it when I go up long steep hills. When the vehicle goes downhill for a while it will stop knocking. I have tried the oil additive approach and does not seem to work. It made it a little better. The oil consumption is not excessive. Should I go for a new cam,lifters and timing chain or just new lifters? Any suggestions would be appreciated. | ||
| jim randall (Rover47) New Member Username: Rover47 Post Number: 24 Registered: 01-2003 |
I would give the rocker arms a close inspection | ||
| A. Ali (Alia176) Member Username: Alia176 Post Number: 42 Registered: 03-2003 |
Like Jim said, I'd at least pop the rocker covers off and take a look. You may just have sludge buildup or something like that. | ||
| Mark D. Mathews (Mdm) New Member Username: Mdm Post Number: 18 Registered: 12-2002 |
I have a lot of build up. What do I look for regarding the rocker arms? The problem is directly related to the incline of the road. I have run STP thru the motor, but no luck on getting rid of the problem. | ||
| Mark D. Mathews (Mdm) New Member Username: Mdm Post Number: 19 Registered: 12-2002 |
My water pump went on Thursday. I then broke off four of the bolts while removing the water pump. Since I have to remove the front cover now I am planning on getting a new cam and lifters. | ||
| eric johnson (Eric2) New Member Username: Eric2 Post Number: 1 Registered: 05-2003 |
Yeah, check your rockers also. I thought I had a bad lifter and it turned out to be one of the steel inserts in one of the rocker arms getting pushed deeper into the rocker arm. The push-rod clearance ended up more than .125 rather than .030. Sounds just like a bad lifter. I got new rocker assemblies for around $100 ea. from the dealer, believe it or not. Prolly the only thing from the dealer thats cheaper than our usual supply houses. I ended up pulling the engine and am having it rebuilt. ('90 - 3.9 w/160K miles) The main bearings had most of the white metal gone - down to the copper. Replace your timing chain while your there. RPi has all the stuff you'd need. And a performance cam available. | ||
| Brian Stolpa (87hprover) New Member Username: 87hprover Post Number: 14 Registered: 02-2003 |
or you can have a good cam custom ground by engle in cal, they ground me one and the truck runs awesome, also you can get lifters from summit, crane, also a better timing chain from cloyes, a true dual roller setup, much less slack then stock chains and cheaper too if you are interested I can get you part numbers | ||
| eric johnson (Eric2) New Member Username: Eric2 Post Number: 9 Registered: 05-2003 |
What is the grind on your cam? Lift, duration, etc. Thanks |
