4x4 & MPV Driver - 40% subscription discount

The Toyota Landcruiser Owners Club
Landcruiser Club - Dedicated to Toyota Landcruiser, Amazon, Colorado and Prado Owners
 
 FAQFAQ   SearchSearch   Watched TopicsWatched Topics   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your personal messagesLog in to check your personal messages   Log inLog in 
TLOCUK Club ShopClub Shop  TLOCUK Classified Ads serviceClassified Ads  dynamic online chat serviceChatrooms  Yellow Diamond ClubsYellow Diamond Clubs
TLOCUK HomeTLOCUK Home   TLOCUK ForumsTLOCUK Forums  Click here to link to the South African LandCruiser Owners Club websiteLCCSA  Click here to link to the Australian LandCruiser Owners OnLine website - possibly the longest established Land Cruiser club on the net!LCOOL  Click here to link to the IH8MUD website - run by extremely enthusiastic Land Cruiser owners, with a fantastic source of DIY information and useful forum!IH8MUD

cracked head !!

Goto page Previous  1, 2, 3
 
Post new topic   Reply to topic    The Toyota Landcruiser Owners Club Forum Index -> 90 Series / Prado / Colorado Technical Forum
View previous topic :: View next topic  
Author Message
andy
Moderator


Joined: 16 Dec 2003
Posts: 1944
Location: Polegate, Sussex, England.

PostPosted: Sun Jan 16, 2011 19:26    Post subject: Reply with quote

If you want to see a cracked head have a look HERE
_________________
It's Not a Bl**dy Jeep it's a Landcruiser
100 Series VX Limited
Mercedes Sprinter 311 Luton
1993 VX80 4.2td SOLD
1996 Hilux Surf SSR-G Intercooler Sold
1994 Hilux Surf SSR-V Sold
Back to top
View user's profile Send personal message AIM Address
Google
Sponsor





PostPosted: Sun Jan 16, 2011 19:26    Post subject: Google Ads keep this community free to join!


Back to top
benterrier
***


Joined: 29 Dec 2009
Posts: 171
Location: hereford

PostPosted: Mon Jan 17, 2011 17:17    Post subject: Reply with quote

andy wrote:
If you want to see a cracked head have a look HERE


Yes, cracked head topics does make interesting reading on this website

Regards
Benterrier
Back to top
View user's profile Send personal message
boxa
**


Joined: 04 Aug 2009
Posts: 102
Location: coventry

PostPosted: Mon Jan 17, 2011 17:31    Post subject: Reply with quote

can anybody vouch for the quality of the heads from roughtrax they say made by amc !!
_________________
97 landcruiser prado tx limited
98 nissan micra
2006 lti tx2 (london taxi)work vehicle
2001 fiesta lx
2007 golf tdi
2004 rav xt4 d4d
Back to top
View user's profile Send personal message
KZJ90
***


Joined: 12 Dec 2007
Posts: 225
Location: Finland

PostPosted: Wed Jan 19, 2011 0:09    Post subject: Reply with quote

BobMurphy wrote:

I'm going to put some 6mm or 8mm holes in the nearside blanks (and maybe others) and see what happens.

Ive heard those holes are not open for correct water flow, more holes could cause bad flow in some areas inside the head. Just warning... I dont really know, I thought the same thing but left them like they are designed.
_________________
Land Cruiser KZJ90 -96
*2" bodylift + 1" spacers at front
*33x12.50R17 tyres
*water-intercooler + chip
*3" down pipe + exhaust
Back to top
View user's profile Send personal message
KZJ90
***


Joined: 12 Dec 2007
Posts: 225
Location: Finland

PostPosted: Wed Jan 19, 2011 0:10    Post subject: Reply with quote

andy wrote:
If you want to see a cracked head have a look HERE


My both old heads (stock oem and chinese copy) are cracked inside the combustion chamber.

KZJ90 wrote:
BobMurphy wrote:

I'm going to put some 6mm or 8mm holes in the nearside blanks (and maybe others) and see what happens.

Ive heard those holes are not open for correct water flow, more holes could cause bad flow in some areas inside the head. Just warning... I dont really know, I thought the same thing but left them like they are designed.

_________________
Land Cruiser KZJ90 -96
*2" bodylift + 1" spacers at front
*33x12.50R17 tyres
*water-intercooler + chip
*3" down pipe + exhaust
Back to top
View user's profile Send personal message
KZJ90
***


Joined: 12 Dec 2007
Posts: 225
Location: Finland

PostPosted: Wed Jan 19, 2011 0:15    Post subject: Reply with quote

Why I cannot edit/delete my posts?!?
_________________
Land Cruiser KZJ90 -96
*2" bodylift + 1" spacers at front
*33x12.50R17 tyres
*water-intercooler + chip
*3" down pipe + exhaust
Back to top
View user's profile Send personal message
boxa
**


Joined: 04 Aug 2009
Posts: 102
Location: coventry

PostPosted: Mon Jan 24, 2011 17:17    Post subject: Reply with quote

well all done now new roughtrax complete head and toyota gasket. new thermostat. new radiator. belts. all filters and oil i finally finished building her up yesterday and remakably she started virtually immediately and shes running perfectly no issues with bleeding just put both heaters on hot and let her tick over with rad cap off for a while ive since  took her for a good run and its running better than ever. this may have something to do with blanking of the egr. i was amazed at how much sludgy carbon this puts into your inlet manifold i spent an hour cleaning it out and there was no way my nice new shiny AMC head was getting full of all that again it really was worth doing and as i was in there anyway i just did it. i can honestly say that this head change really tested my patience im very mechanicaly competent and have all the tools but there are a few things like removing the egr pipes that would test the patience of a saint 3- 10mm bolts on back of head are a complete nightmare let alone the 4  12mm nuts and bolts on egr system pipework and the inlet manifold was another nightmare connecting it all back together  but despite all of the problems doing the head change i can honestly say i enjoyed doing it. when you pull one of these apart you realise just how well made they are the build quality is second to none i had no bolts break or threads shear and everything came apart as it should without any major issues you just need a lot of patience and i mean a lot !!! not so much as a washer left over when finished and now im back in love with her it was worth every penny of the rebuild and hopefully shell be good for a long time to come if anybody needs any tips on a head change im ya man  Very Happy
_________________
97 landcruiser prado tx limited
98 nissan micra
2006 lti tx2 (london taxi)work vehicle
2001 fiesta lx
2007 golf tdi
2004 rav xt4 d4d
Back to top
View user's profile Send personal message
KZJ90
***


Joined: 12 Dec 2007
Posts: 225
Location: Finland

PostPosted: Mon Jan 24, 2011 17:23    Post subject: Reply with quote

boxa wrote:
my nice new shiny AMC head


Well done! I have done it twice too, the second time was much easier, but wish I had choose the original head/not chinese at first time. What is AMC?
_________________
Land Cruiser KZJ90 -96
*2" bodylift + 1" spacers at front
*33x12.50R17 tyres
*water-intercooler + chip
*3" down pipe + exhaust
Back to top
View user's profile Send personal message
boxa
**


Joined: 04 Aug 2009
Posts: 102
Location: coventry

PostPosted: Mon Jan 24, 2011 17:23    Post subject: Reply with quote

forgot to mention i also fitted genuine thermostat and bought 10 litres of toyota red premix
_________________
97 landcruiser prado tx limited
98 nissan micra
2006 lti tx2 (london taxi)work vehicle
2001 fiesta lx
2007 golf tdi
2004 rav xt4 d4d
Back to top
View user's profile Send personal message
boxa
**


Joined: 04 Aug 2009
Posts: 102
Location: coventry

PostPosted: Mon Jan 24, 2011 17:51    Post subject: Reply with quote

AMC are a company that manufacture heads for a lot of companys worlwide including toyota i did my research and was told by a few top end mechanics that they are the best available and are definately worth  fitting on a landcruiser as this is the weak point on an otherwise solid engine hence genuine toyota head gasket definately worth the money
_________________
97 landcruiser prado tx limited
98 nissan micra
2006 lti tx2 (london taxi)work vehicle
2001 fiesta lx
2007 golf tdi
2004 rav xt4 d4d
Back to top
View user's profile Send personal message
BobMurphy
Lifetime member
Lifetime member


Joined: 01 Aug 2008
Posts: 1731
Location: Kirkliston, Scotland

PostPosted: Mon Jan 24, 2011 18:34    Post subject: Reply with quote

KZJ90 wrote:
Ive heard those holes are not open for correct water flow, more holes could cause bad flow in some areas inside the head. Just warning... I dont really know, I thought the same thing but left them like they are designed.


I know what you mean.

I had the same issue with a Landrover 2.5l petrol engine that would overheat when towing. I opened up some of the blanked-off holes and it didn't make much difference.

It wasn't blowing coolant out of the radiator though. I think that is caused by steam that can't escape from the nearside so just produces an airlock that pushes coolant into the head and out of the rad.

I may be wrong, we'll see.

It can't go on so I have to try something.


Bob.
Back to top
View user's profile Send personal message
regthing
Lifetime member
Lifetime member


Joined: 24 Dec 2007
Posts: 551
Location: Dunoon, Scotland

PostPosted: Mon Jan 24, 2011 19:16    Post subject: Reply with quote

Well done  Very Happy . It is very rewarding, especially when you turn the key and it starts first time (altough it took be two attempts to achieve that  Rolling Eyes  Laughing )
_________________
'98 Colorado KZJ95 1KZTE
General Grabber AT2s, Ironman Suspension and working my way round the worn bits!
Back to top
View user's profile Send personal message
pilotwilson
*


Joined: 16 May 2015
Posts: 19
Location: Oxon

PostPosted: Mon Apr 29, 2019 16:49    Post subject: cracked head? Reply with quote

boxa wrote:
well all done now new roughtrax complete head and toyota gasket. new thermostat. new radiator. belts. all filters and oil i finally finished building her up yesterday and remakably she started virtually immediately and shes running perfectly no issues with bleeding just put both heaters on hot and let her tick over with rad cap off for a while ive since took her for a good run and its running better than ever. this may have something to do with blanking of the egr. i was amazed at how much sludgy carbon this puts into your inlet manifold i spent an hour cleaning it out and there was no way my nice new shiny AMC head was getting full of all that again it really was worth doing and as i was in there anyway i just did it. i can honestly say that this head change really tested my patience im very mechanicaly competent and have all the tools but there are a few things like removing the egr pipes that would test the patience of a saint 3- 10mm bolts on back of head are a complete nightmare let alone the 4 12mm nuts and bolts on egr system pipework and the inlet manifold was another nightmare connecting it all back together but despite all of the problems doing the head change i can honestly say i enjoyed doing it. when you pull one of these apart you realise just how well made they are the build quality is second to none i had no bolts break or threads shear and everything came apart as it should without any major issues you just need a lot of patience and i mean a lot !!! not so much as a washer left over when finished and now im back in love with her it was worth every penny of the rebuild and hopefully shell be good for a long time to come if anybody needs any tips on a head change im ya man Very Happy

just clocked 302000 miles (40,000 of which i've put on trouble free) and today i have steam out of the exhaust Sad no discernible loss of power. reading through the threads here, it seems a replacement head is what is needed and isn't a too difficult job for a keen amateur like me. any pointers beyond what i've trawled through here? TIA
_________________
1998 95J vx 3.0 d auto
work, hobby & family vehicle - loving the heated seats in winter 290,000 m service approaching.
Back to top
View user's profile Send personal message
Mike TLC
Lifetime member
Lifetime member


Joined: 21 May 2010
Posts: 56
Location: France

PostPosted: Mon Apr 29, 2019 17:41    Post subject: Reply with quote

Sorry to here about this.

Do not rule out the possibility of it being just a blown head gasket...

I had my head done by Toyota under guarantee (100,000 km ago) so I'm not much help but "BobMurphy" is likely to be an expert on pointers for this job.

I went with the 76C thermostat as well (the one from the later 2000 model that did not have the cracked head syndrome)). There is forum debate about this thermostat change but read on... and make your own mind up.

Out of curiosity (I prefer reality to discussion), I put an aftermarket temperature gauge on the coolant outlet and this reads at between 66 (winter motorway @65 mph) and 78C (summer motorway @65 mph) which is more than I expected.  It always reads 74C on stationary tick-over. My mechanic has checked its accuracy.

However the readout climbs very fast and steadily to 85+C when on uphill motorway stretches in alpine regions or even when going over Cairn O' Mount in Aberdeenshire. It would obviously continue to get hotter if the hill climbing continued but for the moment I have always topped out before going over 85C, so I have no idea how high it would go with a longer climb or with a trailer/horsebox etc.

And this is coolant outlet temperature, not internal cylinder head temperature, which will be hotter.

I have had no problems since.

I am still wary of this engines cooling capacity when overloaded. Even though it's an engine that can, and has been raced very successfully in many N. African events, it does seem to have a weak point in this area.
_________________
December 1999 KZJ95 GS (1KZ-TE) manual
Underbody armour
Back to top
View user's profile Send personal message
Display posts from previous:   
Post new topic   Reply to topic    The Toyota Landcruiser Owners Club Forum Index -> 90 Series / Prado / Colorado Technical Forum All times are GMT + 1 Hour
Goto page Previous  1, 2, 3
Page 3 of 3

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


All contents © Hobson's Choice IT Solutions Ltd 1997 on
Powered by phpBB © 2001, 2005 phpBB Group