View previous topic :: View next topic |
Author |
Message |
andy Moderator
Joined: 16 Dec 2003 Posts: 2260 Location: Polegate, Sussex, England.
|
Posted: Sun Jan 16, 2011 19:26 Post subject: |
|
|
If you want to see a cracked head have a look HERE _________________ It's Not a Bl**dy Jeep it's a Landcruiser
150 series Invincible X
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 |
|
|
Google Sponsor
|
Posted: 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
|
Posted: Mon Jan 17, 2011 17:17 Post subject: |
|
|
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 |
|
|
boxa **
Joined: 04 Aug 2009 Posts: 102 Location: coventry
|
Posted: Mon Jan 17, 2011 17:31 Post subject: |
|
|
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 |
|
|
KZJ90 ***
Joined: 12 Dec 2007 Posts: 225 Location: Finland
|
Posted: Wed Jan 19, 2011 0:09 Post subject: |
|
|
BobMurphy wrote: |
I'm going to put some 6mm or 8mm holes in the nearside blanks (and maybe others) and see what happens.
|
I´ve 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 don´t 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 |
|
|
KZJ90 ***
Joined: 12 Dec 2007 Posts: 225 Location: Finland
|
Posted: Wed Jan 19, 2011 0:10 Post subject: |
|
|
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.
|
I´ve 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 don´t 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 |
|
|
KZJ90 ***
Joined: 12 Dec 2007 Posts: 225 Location: Finland
|
Posted: Wed Jan 19, 2011 0:15 Post subject: |
|
|
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 |
|
|
boxa **
Joined: 04 Aug 2009 Posts: 102 Location: coventry
|
Posted: Mon Jan 24, 2011 17:17 Post subject: |
|
|
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 _________________ 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 |
|
|
KZJ90 ***
Joined: 12 Dec 2007 Posts: 225 Location: Finland
|
Posted: Mon Jan 24, 2011 17:23 Post subject: |
|
|
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 |
|
|
boxa **
Joined: 04 Aug 2009 Posts: 102 Location: coventry
|
Posted: Mon Jan 24, 2011 17:23 Post subject: |
|
|
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 |
|
|
boxa **
Joined: 04 Aug 2009 Posts: 102 Location: coventry
|
Posted: Mon Jan 24, 2011 17:51 Post subject: |
|
|
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 |
|
|
BobMurphy Lifetime member
Joined: 01 Aug 2008 Posts: 1739 Location: Kirkliston, Scotland
|
Posted: Mon Jan 24, 2011 18:34 Post subject: |
|
|
KZJ90 wrote: |
I´ve 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 don´t 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 |
|
|
regthing Lifetime member
Joined: 24 Dec 2007 Posts: 551 Location: Dunoon, Scotland
|
Posted: Mon Jan 24, 2011 19:16 Post subject: |
|
|
Well done . It is very rewarding, especially when you turn the key and it starts first time (altough it took be two attempts to achieve that ) _________________ '98 Colorado KZJ95 1KZTE
General Grabber AT2s, Ironman Suspension and working my way round the worn bits!
|
|
Back to top |
|
|
pilotwilson *
Joined: 16 May 2015 Posts: 19 Location: Oxon
|
Posted: Mon Apr 29, 2019 16:49 Post subject: cracked head? |
|
|
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 |
just clocked 302000 miles (40,000 of which i've put on trouble free) and today i have steam out of the exhaust 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 |
|
|
Mike TLC Lifetime member
Joined: 21 May 2010 Posts: 57 Location: France
|
Posted: Mon Apr 29, 2019 17:41 Post subject: |
|
|
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 76°C 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 78°C (summer motorway @65 mph) which is more than I expected. It always reads 74°C 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 85°C, 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 |
|
|
|