Rising Sun Member Forums  

Go Back   Rising Sun Member Forums > Toyota 4x4 > General Tech Forum

Reply
 
Thread Tools
  #21  
Old 02-18-2007, 08:11 PM
Deerskin Deerskin is offline
Rock Stacker
 
Join Date: Jul 2006
Location: Sedalia, CO
Posts: 13
Default

Plug #4 looks normal. The valve springs are good, nothing broken or collapsed. That was my initial thought from Matt's description of blow-back thru the carb. The entire valve train looks good except for the failure to seat as previously discussed.
__________________
'96 FZJT80, Locked
Reply With Quote
  #22  
Old 02-18-2007, 08:23 PM
Deerskin Deerskin is offline
Rock Stacker
 
Join Date: Jul 2006
Location: Sedalia, CO
Posts: 13
Default

I know the valves can't hit a plug, but if the heads use replaceable valve seats and a seat came loose, banged around head area as the valve cycled and fuel air charge is pumped thru the cylinder, the question is; could a loose valve seat reach the plug to inflict the damage as seen on #5 and #6? Kind of like the valve seat doing the hula hoop around the valve stem as the valve cycles.

It's all probably interesting discussion until the head comes off.......
__________________
'96 FZJT80, Locked
Reply With Quote
  #23  
Old 02-18-2007, 08:26 PM
leiniesred leiniesred is offline
Hard Core 4+
 
Join Date: Aug 2005
Location: Aurora, CO, USA
Posts: 1,282
Default

Wow. Great pictures, Matt. The backfire out the carb is because that valve doesn't seat. Valve doesn't seat because there is a piece of something big in it. The "something" banged around a while and damaged the plug before it got stuck. The gap on that rocker is because the valve won't seat.

The red on the plug is OK. That's just addatives. probably from running the HEET for 20 minutes.

Now how you got mechanical damage in 3 cylinders at once: I don't get it. I guess it is possible that when the valve got stuck open chunks from the bad cylinder got pushed back up into the manifold and sucked down another jug.

No matter what, you're pullin' the head on this one. With that much damage, I think you'll find some beat up piston heads as well as the head damage. Sorry. It may very well be time for a different engine.
__________________
KD0FDS
Stephen
Reply With Quote
  #24  
Old 02-18-2007, 10:23 PM
wesintl's Avatar
wesintl wesintl is offline
Hard Core 4+
 
Join Date: Aug 2005
Location: in da house
Posts: 7,554
Send a message via AIM to wesintl
Default

put new plugs in... adjust the valves and see how it runs
__________________
See you on the trail
WØREK
Couple o' FJ40's, BJ70, UZJ100, TDI 66FJ40,82FJ60,97FZJ80
TLCA#4180
Reply With Quote
  #25  
Old 02-19-2007, 05:26 AM
60wag's Avatar
60wag 60wag is offline
Rising Sun Member
 
Join Date: Aug 2005
Posts: 1,790
Default

The intake valve on #5 is either bent or has something caught in it. I'm with Steve on this - pull the head. It could be a chunk of a broken spark plug or something that got sucked in through the intake manifold. I vagely remember a Mud thread about some bolt in the carb coming loose and ending up in a cylinder. This might be similar.
__________________
Bruce
'96FZJ80
'03 KTM 450EXC
"If you know what you're doing, then you aren't learning anything." - A. Lincoln
Reply With Quote
  #26  
Old 02-19-2007, 11:12 AM
Hulk's Avatar
Hulk Hulk is offline
Cruise Moab Committee
 
Join Date: Aug 2005
Location: South Side!
Posts: 11,423
Send a message via AIM to Hulk
Default

If your pistons aren't shot, you'll only be down for a week if you pull the head. If you simply replace the plugs, you may get it to run again and do further, much more severe damage.
__________________
Matt Farr, Centennial, Colorado | Webmaster: TLCA.org
1996 FZJ80 · TLCA #4189 · WØRDY
www.rustybrain.com/cruisers · my Rising Sun bio · Facebook · Twitter · Need satellite Internet? Check out: Exede Internet

If you think you can or think you can't, you're right.
Reply With Quote
  #27  
Old 02-19-2007, 12:03 PM
treerootCO's Avatar
treerootCO treerootCO is offline
Rising Sun Member
 
Join Date: Aug 2005
Posts: 4,446
Send a message via AIM to treerootCO
Default

I have an empty trailer behind the dmax today. Let me know if you wanted to move the Cruiser to your dad's place today. I have extra F parts laying around. Some of them will cross over to the 2F engine.
__________________
aka Mike D.----->Bio Page KDøGWY
“He who goes unarmed in paradise had better be sure that that is where he is.”—James Thurber
"Its better to be thought a fool rather than to speak up and remove all doubt." - Lincoln
pride is ego, the word I had lost was dignity. The quality or state of being worthy of esteem or respect.
Ptarmigan build thread - 95FZJ80
www.root45.com
www.risingsun4x4club.org

TLCA #14133

Reply With Quote
  #28  
Old 02-19-2007, 01:06 PM
subzali's Avatar
subzali subzali is offline
Rising Sun member
 
Join Date: Aug 2005
Location: Denver CO
Posts: 7,550
Default

Yeah, definitely not starting it again until I take the head off and see what's going on.

Thanks Root, not today but soon I might be giving you a call

Anybody wanna come gawk at it while it's still up here? I guess the mystery is no longer as much of a mystery now that I pulled the plugs at Zepp's suggestion...
__________________
Matt Miller
TLCA# 13684
Rising Sun Bio
1977 FJ40 2F "Brahma" + Lockright, tach, Warn 8274, FJ60 Power Steering, soon to lose the Sanden OBA to go back to factory emissions
1996 FZJ80 1FZ-FE factory lockers + Safari Turbo , CDL switch, cup holder, AATLAS1X leather, heated seats and JDM switches
2000 Tundra Limited TRD 2UZ-FE SOLD
Reply With Quote
  #29  
Old 02-19-2007, 01:42 PM
treerootCO's Avatar
treerootCO treerootCO is offline
Rising Sun Member
 
Join Date: Aug 2005
Posts: 4,446
Send a message via AIM to treerootCO
Default

I found the thread on mud and I think Grant is right on this one. Your cam probably slipped.
__________________
aka Mike D.----->Bio Page KDøGWY
“He who goes unarmed in paradise had better be sure that that is where he is.”—James Thurber
"Its better to be thought a fool rather than to speak up and remove all doubt." - Lincoln
pride is ego, the word I had lost was dignity. The quality or state of being worthy of esteem or respect.
Ptarmigan build thread - 95FZJ80
www.root45.com
www.risingsun4x4club.org

TLCA #14133

Reply With Quote
  #30  
Old 02-19-2007, 10:17 PM
MDH33's Avatar
MDH33 MDH33 is offline
Rising Sun Member
 
Join Date: Mar 2006
Location: Land of Corn
Posts: 5,784
Default

I have never had a 2F apart so I can't speak from direct experience on this one, but I have had a bunch of old school Honda motorcycle engines apart. Many have long cam chains and jumping a tooth isn't unheard of. When they do, the valves contact each other or a valve and a piston contact, causing some disintegration/breakage. Likely cause of your plug damage. I would get the head off and take a look to see what's in there jamming in the valves.

Oleg has a rebuilt 2F for sale
__________________
--Martin

'85 FJ60
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -6. The time now is 02:18 PM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.