Question about Toyota Land Cruiser

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G'day. removing head without service manual, would like to know correct sequance so i minimise warping risk. thanx.

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Dont matter what engine it is you start in the middle top and bottom and then do left then right left then right and so on ,if this is a aluminum head head then about 65/780 lbs is enough torque ,yes i know the book says new head bolts and all that but thats only for the daler to make more money ,make sure the head bolt thread holes are cleaned out with a bit of rag on the end of a screwdriver as any oil and water in them could hydraulic as you tighten the bolts and split the block .best of british with your endevours

Posted on Mar 25, 2011

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Posted on Jan 02, 2017

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The reason for this is that although potentially this is an easy fix and is likely to be a thermostat that needs replacing (jammed shut) - there is a risk that the jeep has been running for some time with this overheating problem. At least you don't know how long it has been driven like this.

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Pressure low.


You can recheck what the mechanic found, looking for the bubbles and sniffing at the opening of your coolant reservoir; if it smells like fuel or exhaust, he is probably right about the failed gasket.
 
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If the gasket fails from a cylinder only into the water jacket, it will leak hot combustion gases into the cooling system and the cooling system can't cope with it therefore the overheating.
When the engine cools down, it can **** water into a cylinder and cause misfires and even make your sparkplugs rusty.
    
If the head gasket fails between oil and coolant channels, the oil will turn into hand lotion (and not lubricate well) and the coolant will be visibly oily.
 
Aluminum blocks and heads properly designed won't warp much worse than cast iron and any of them should be carefully checked for warp before reassembly. A few thousandths of an inch is OK since the head gasket can tolerate some imperfections in the fit.
When reassembling, applying the prescribed amount of torque (quite a bit) deforms the gasket and it will take up small deviations from perfectly flat.
 
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Any service manual will contain the maximum amount of 'milling' that can be done without worrying about the pistons hitting the valves or underside of the head.   
 
Don’t let the engine overheat, this will cause serious warping and could damage bearings if the oil gets too thin from the heat. 

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