|
|
|
Your donations help keep this valuable resource free and growing. Thank you.
|
lifter falure |
Post Reply 
|
| Author | |
amc80jeep 
AMC Fan 
Joined: Apr/08/2023 Location: idaho Status: Offline Points: 2 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: lifter falurePosted: Apr/09/2023 at 12:07am |
|
i have a cj5 with a 78 360 in it . it ran ok but had some issues . so i just had the heads done and put in a new milling MTA-1 cam and lifters new timing chain rebuilt the oil pump new push rods
just got everything back together last weekend i used the cam lube primed the oil system and started to to cam break-in 7 to 10 min. in and I started to here vale train noise today i pulled the valve covers and intake off and found all but 3 lifers ruined and metal all over any idea why this happened? |
|
 |
|
|
tufcj
Supporter of TheAMCForum 
Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4086 |
Post Options
Thanks(0)
Quote Reply
Posted: Apr/09/2023 at 7:33am |
|
Did you match valve springs to the cam /lifter manufacturers specs? Too strong springs during break-in will wipe a lobe faster than anything. Some builders use a lighter spring during break-in, then swap to recommended springs. Bob tufcj
|
|
|
69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
|
|
|
|
sweatlock
AMC Addicted 
Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3313 |
Post Options
Thanks(0)
Quote Reply
Posted: Apr/09/2023 at 11:19am |
|
Possible issues: improper hardening of the lifter face, lifters not rotating.
Or too strong of a spring for break-in, as stated above. Many here have stated that they have disassembled new lifters and cleaned out any debris. Then re-assembled and soaked in clean oil overnight before installation. This is assuming hydraulic lifters.
Edited by sweatlock - Apr/09/2023 at 11:22am |
|
|
|
|
Gench
AMC Apprentice 
Joined: Oct/09/2021 Location: Boulder CO ish Status: Offline Points: 182 |
Post Options
Thanks(0)
Quote Reply
Posted: Apr/09/2023 at 6:33pm |
|
I recommend leaving the valve covers off during the cam’s initial run so you can spin push rods by hand as needed to keep the lifters rotating.
|
|
|
|
|
Post Reply
|
|
Tweet
|
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Click for TheAMCForum Rules
Topic Options