LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Broken lifters. Need info.

Thread Tools
 
Search this Thread
 
Old Mar 21, 2011 | 11:04 PM
  #16  
Injuneer's Avatar
Administrator
 
Joined: Nov 1998
Posts: 71,110
From: Hell was full so they sent me to NJ
Re: Broken lifters. Need info.

Originally Posted by dodge69874
Yeah, about the compression check. I've seen it when like seven cylinders are between like 175-210 and then you get that one which is at like 90 and you know you've found the bad one.

Also, I was going through some old shop manuals that my dad had and was looking at the valve adjustment for the Chevy 350 V8's. They had the same firing order as the LT1 and it outlined this procedure for adjusting the valves.

Set the engine in the No.1 firing position and to adjust the following valves:
Intake: 1,2,5,7
Exhaust: 1,3,4,8

Back off the adjusting until lash is felt at the pushrod, then turn the nut in to remove all lash. When lash is removed the pushrod will not rotate. Turn nut in another full turn (though it's been said on here that 1/2 or 3/4 should be enough).

Rotate the crankshaft one full turn to realign the pulley notch and the timing tab zero mark in the No. 6 firing position. Adjust the following valves:
Intake: 3,4,6,8
Exhaust: 2,5,6,7
Shoebox has a procedure that works just fine on the LT1. Have you looked at it? Have you tried to find it?

http://shbox.com/1/4th_gen_tech2.html#adjust_valves

Did you even read my post about the specs and the firing order, which explained the LT1 has the same firing order as a "Chevy 350 V8" because is IS a Chevy 350 V8. It just happens to be a minor variation called "Gen 2" because of the Opti and the reverse flow cooling.

You have to take the time to read the help people try to give you.
Old Mar 22, 2011 | 10:06 AM
  #17  
dodge69874's Avatar
Thread Starter
Registered User
 
Joined: Aug 2010
Posts: 300
From: Miami, FL
Re: Broken lifters. Need info.

Yes, I did read what you wrote about how the LT1 is a Chevy 350. But I wanted to make sure that the engine I was reading about was the the Chevy 350. Not that I didn't trust you, but it never hurts to verify that the procedure that is being outlined is for the right motor. And yes, I did read shbox's guide on adjusting the valves. But this seems so much simpler than finding the TDC for each cylinder, so I was wondering if it was a proper method for adjusting the valves on a Chevy 350, or if anyone had ever done it like this before.
Old Mar 22, 2011 | 12:21 PM
  #18  
shoebox's Avatar
Registered User
 
Joined: Dec 1969
Posts: 27,728
From: Little Rock, AR
Re: Broken lifters. Need info.

Originally Posted by dodge69874
Yes, I did read what you wrote about how the LT1 is a Chevy 350. But I wanted to make sure that the engine I was reading about was the the Chevy 350. Not that I didn't trust you, but it never hurts to verify that the procedure that is being outlined is for the right motor. And yes, I did read shbox's guide on adjusting the valves. But this seems so much simpler than finding the TDC for each cylinder, so I was wondering if it was a proper method for adjusting the valves on a Chevy 350, or if anyone had ever done it like this before.
The very same procedure is listed on my site as well as other ways that people like to do it. All of them give the same results. I think some people are getting a little frustrated in that you say you have read stuff, but your replies seem like you really haven't. Any valve adjustment procedure you read for an SBC will work with an LT1 (since like Fred said, it is an SBC).
Old Mar 22, 2011 | 05:40 PM
  #19  
dodge69874's Avatar
Thread Starter
Registered User
 
Joined: Aug 2010
Posts: 300
From: Miami, FL
Re: Broken lifters. Need info.

Well, thanks for all the help guys. Spent the day replacing the lifters and putting everything back together. But as we were doing the compression check, we came across two valves that were stuck open, one on cylinder #6 and the other on cylinder #8. They caused the pushrods to bend as we were adjusting the valves. So, that is most likely the reason why the old lifters broke. If we can't get them unstuck tomorrow, then we'll most likely go ahead and get a new longblock, since I don't think it'd be worth the time and money to rebuild the heads on a 17 year old longblock which might not even be in good condition. My pop says reason why the valves got stuck might be due to lack of oil. He says that oil should have made it to the top of the engine by now with the cranking we've been doing to adjust the valves. So, yeah, I guess tomorrow we shall see what happens and then we'll make the decision.

Thanks for all the help guys. You've all been great and I do appreciate all the info you've thrown my way. And I know I may have sounded noobish and all, but I am learning with all this. Last time I my dad rebuild a 350 Chevy was back in like '04 and I wasn't there for most of it. So this time around I am learning a great deal and hopefully I'll be able to apply all this information towards a build some day once I get a decent engine. Well, thanks again.

Last edited by dodge69874; Mar 22, 2011 at 05:42 PM.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Z Power
LT1 Based Engine Tech
8
Sep 19, 2015 11:19 PM
mmf_1013
General 1967-2002 F-Body Tech
0
Sep 12, 2015 08:56 PM
Toxintwins
General 1967-2002 F-Body Tech
1
Sep 11, 2015 11:13 AM
Daluchman1974
Cars For Sale
1
Sep 11, 2015 06:12 AM
maverickmk
South Atlantic
0
Sep 1, 2015 09:17 PM




All times are GMT -5. The time now is 07:59 AM.