Hilux with 253 V8 - overheating!
Submitted: Saturday, Aug 21, 2004 at 21:28
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markp
How many guys out there who have a Hilux with a V8 have overheating problems?
I have tried everything I can think of. I rebuilt the engine and initially put most of my problem down to it being a bit tight, but now have done 20K kms and engine is quite free. Have tried numerous radiators, have mucked around with timing, different exhausts, thermo fans, engine oil coolers, have tried it with bonnet off, have tried it with bull bar off, have checked
water jacket passages, rechecked head gaskets. You name it I have tried it. This time of year it is not a big deal - runs at a constant 92deg. But in summer about 95deg! I have not been prepared to go bush since it would run hotter at low speeds. Running out of ideas - has anyone else had much trouble in this area with this conversion?
Reply By: V8Diesel - Sunday, Aug 22, 2004 at 09:27
Sunday, Aug 22, 2004 at 09:27
Markp, I had a HJ60 with a 308 and Toyota 4peed auto in it. Always ran hot. Twin 16" thermo's, Ford GT 7 blade fan, new fan clutch, timing, different shrouds on radiator, set radiator 2" back to fan with adaptor brackets, ran with bonnet tied up to force air past motor exiting underneath to see if 'airlock effect' was happening, thermostat in and out, radiator apart twice, second time I personally cleaned every core, checked gauges, tried running it on LRP / ULP / PULP, new hoses with the stainless coil inserts in case they were sucking in etc etc......
My solution was to sell it and buy a Patrol. Also fixed the 250km range problem.
One thing that might be worth looking into for your situation is regarding the intake manifold on the rebuilt 253. I'm pretty rusty on these motors now, but there are a number of different gasket sets for Holdens (red, red smog, black, 304 etc) from distant memory. See you've checked
water jacket passages, but do gaskets correspond? Don't know if this is possible, but gaskets issues ring a bell from my old Monaro days. I'd talk to a Holden fan before I started taking it apart though.
Good luck mate, I know what you're going through.
AnswerID:
73556
Follow Up By: carazy merredin wa - Sunday, Aug 22, 2004 at 19:43
Sunday, Aug 22, 2004 at 19:43
V8DIESEL,
You must make sure that the front
water outlets for the cylinder heads are open to the intake manifold, through to the thermostat & not blocked off by the intake manifold gaskets-because the gaskets are put on the wrong way around or they havent been stamped & removed properly. You can easily check by removing thermostat, put small mirror in there & have a look with a torch or poke a bit of wire down there. I have seen this simple mistake a couple of times & the last time this happened one the heads ended up cracked because it was getting too hot-took too long to fix fault!
Hope this helps someboddy, carazy.
FollowupID:
333712
Follow Up By: V8Diesel - Sunday, Aug 22, 2004 at 20:12
Sunday, Aug 22, 2004 at 20:12
Yeah carazy, that's the bugger all right. It's all starting to come back to me through the distant smoke haze.
FollowupID:
333714
Reply By: Utemad - Sunday, Aug 22, 2004 at 14:28
Sunday, Aug 22, 2004 at 14:28
My brother has a 351 in a 45 troopy and he has also tried everything to stop it over heating. It really is a pain in the arse to have spent all that money on a super capable machine (has diff locks etc also) yet you can't do any low speed work. He must get reallybleepwhen my 4 cyl Rodeo gets further than his super Cruiser because of over heating.
His solution is to leave it in the garage and drive his work fourby.
AnswerID:
73574
Reply By: Pauly - Sunday, Aug 22, 2004 at 14:41
Sunday, Aug 22, 2004 at 14:41
Markp i put a 253 in VK commodore rebuilt the lot and yes it over heated a lot tried most of the things you listed but my solutuion was to machine a new pully for the
water pump made it smaller so it would spin faster to move the
water through quicker it actually worked hasnt over heated since.
cheers paul
AnswerID:
73575
Reply By: Moz - Sunday, Aug 22, 2004 at 19:09
Sunday, Aug 22, 2004 at 19:09
mark,
Don't know if this applies but I heard of a 351 in an old GT constantly
overheating and after trying many things they put in a new engine block.
The consensus was the motor had been worked so many times the
cylinder walls were too thin and were transferring too much heat to
the coolant.
Moz
AnswerID:
73597