Author Topic: head gasket?  (Read 1826 times)

0 Members and 1 Guest are viewing this topic.


  • Offline Rock Crawl'n
  • **
  • Turtle Points: 84
  • Posts: 39
  • Member since Jun '04
  • Crawling with Marlin
    • View Profile
head gasket?
« on: Sep 23, 2004, 06:01:44 PM »
my truck starts and runs okay, but once it gets warm i lose compression in the first two cylinders.  i dont have any water in my oil.  i was told this is the head gasket, but i am not sure.  could it be the rings or valves?  kind of has me confused.  any help is appreciated.


  • Offline Crawler Guru
  • ****
  • Turtle Points: -1
  • Male Posts: 556
  • Member since Oct '03
    • View Profile
Re: head gasket?
« Reply #1 on: Sep 23, 2004, 06:36:44 PM »
Run a compression test on it.  If those two cylinders are low, could be most likely a head gasket.  Maybe pop the valve cover and see how the rocker arms are rocking.
Friends help you move.  Real friends help you move bodies.


  • Inspirational Genius
  • Offline 4WD Legend
  • *
  • Turtle Points: 137
  • Male Posts: 856
  • Member since Sep '02
  • MC³ = 1,148:1
    • View Profile
    • Marlin Crawler
Re: head gasket?
« Reply #2 on: Sep 24, 2004, 01:45:46 AM »
I have seen the head gasket blow between the 1th and 2ed cylinders. Remove both the 1th and 2ed spark plugs and run compression.

However, it sounds like you have tight valves :crossed:
             cold      hot
Intake    .006      .008
Exhaust  .010      .012

Retorque the head and adjust the valves
Cold  57 lbs.   
Hot   63 lbs

1980 Toyota - 1997 3RZ-FE 2.7l Engine, Turbo R151F 4.31:1, Triple Turbo Marlin Crawler Billet (2.28x4.70x4.70) = 1,148:1 Crawl Ratio, Marlin Crawler Twin Stick and Short Throw Shift Kits, 30mm H/D Output Shaft, High Angle Drive Lines, 5.29:1, ARBs, High Pinion Front, 25mm HD Billet High Steer Kit, 6 Pin Locking Hub Bodies, 86+ Wide Rear End, V6 3rd member, Chromolly Axles all around, 37" IROKs with Beadlocks, York onboard air - Rollbar air tank, Premier Power Welder, Marlin Crawler 4" USA-made Leaf Springs, Bilstein Shocks, et cetera....


  • Offline Rock Master
  • ***
  • Turtle Points: 0
  • Male Posts: 170
  • Member since Sep '04
  • Crawling with Marlin
    • View Profile
Re: head gasket?
« Reply #3 on: Sep 24, 2004, 04:06:05 AM »
Marlin, as to those valve tightening specs, I have a cam in my truck and the spec sheet for it says to adjust both to .010 when hot.  I've done this a couple times and the still make noise.  Should I try factory specs on theses adjustments?

Retiring the 91
Rebuilding the 94


  • Administrator
  • Offline Gold Turtle Award
  • *
  • Turtle Points: 1619
  • Male Posts: 17,994
  • Member since Apr '02
  • 511:1 Club
    • View Profile
    • Bone-Stock Plane-Jane 1981 Shortbed Pickup
Re: head gasket?
« Reply #4 on: Sep 24, 2004, 09:28:26 AM »
I would recommend running slightly tighter on the intake side since they do not get as hot and expand less. The reason the cam sheet probably tells you to run them slightly loose is maybe to decrease valve overlap on the exhaust/intake stroke to give you better performance at lower rpms. Makes since if its a pretty aggressive cam, but its really not going to make much difference if you ask me.

Tighten up your intakes to prevent them from hammering out the seats. You dont need to worry about burning an intake valve as you would an exhaust.
New Instagram: @SlowestTacoma

Check out our new Rock Crawling Videos!
2016 56-speed 580:1 Triple T/Case 3rd gen Tacoma Rock Crawler   
1981 36-speed 511:1 3RZ-FE Rock Crawler
1987 6-speed Supercharged 4A-GZE MR2
Things are only impossible until they are not.
"The worst of both worlds, the best of neither." -abnormaltoy
"An informed question. But difficult to answer. I am what you see." -Nanaki


Related Topics

0 Replies
Last post Apr 05, 2005, 12:57:07 PM
by Rebeltilldeath3
7 Replies
Last post Nov 04, 2005, 07:02:27 AM
by 4runnerfromhell
19 Replies
Last post Apr 28, 2006, 02:32:28 PM
by CTENG in KS
3 Replies
Last post Feb 01, 2013, 08:53:32 PM
by Cheesemaker
6 Replies
Last post Aug 04, 2017, 06:04:10 PM