Uprdated Radiator Caps - encourage pourous block - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

chaz_r33_gtr · 10th October 2008, 05:01 PM

Been to RB today as my car seems to be losing a small amount of coolant after a few checks etc.. the block has become porous round the oil banjo on the block near the rear turbo. Coolant leaks out a little.
This has only happened since sticking on a nismo uprated Rad Cap (1.3Bar pressure instead off 0.9).

Rod said dont worry about it they can fix it sometime but means turbos off to do it. Perahps a word of warning to anyone thinking of fitting one for bling factor... Mine was for track days honest ;-)

GouldyGTR · 10th October 2008, 05:40 PM

i think it would have been gone anyway mate but maybe the extra pressure has set off the leak a bit more?

bernmc · 10th October 2008, 06:26 PM

I always get mixed up between RB and RK Tuning, but one of them can supply a ceramic additive - basically empty rad of coolant, flush until its clear water. Pop in the additive and drive around for a few days. the chemical reacts with air and hardens, so seals up the porous bits without sealing the whole block up

.

FLush it all out after a few days, add water and coolant and you're off again.

ExScoobyT · 10th October 2008, 08:03 PM

Its fairly common, my old block did it. Coolant additive is unlikey to fix permanently.

Turbo off, clean area completely and grind slightly with a dremel, then use some `JB Weld` liquid metal over the area. This should provide a good repair. Dont use other makes of liquid metal as JB weld has higher thermal stabilty (250 - 300C Vs 120C of other types)

chaz_r33_gtr · 14th October 2008, 08:05 PM

Thanks for the info. Rod mentioned the ceramic stuff on the outside of the block to fix it.. hence dont worry about it.. The only cost really is the labour messing about taking turbos off etc..

Is it likley to get substantially worse over the course of say 4000miles? Currently im losing an expansion tanks worth after a few weeks of driving say 1000 miles. (Im keeping an eye on my coolant levels very reguarly)..

just give me a bit of time to save up if its going to continue using coolant at this rate

2rismo · 16th October 2008, 10:37 PM

Uprated radiator caps can show up other weaknesses in the cooling system. Haven't really heard of this happening much before with RB's though. Get it fixed ASAP but if it's only weeping and not dribbling out then it's probably okay for a while.

10th October 2008, 05:01 PM	#1 (permalink)
chaz_r33_gtr GTR Register Member Join Date: Aug 2005 Location: Lancashire Posts: 277	Uprdated Radiator Caps - encourage pourous block Been to RB today as my car seems to be losing a small amount of coolant after a few checks etc.. the block has become porous round the oil banjo on the block near the rear turbo. Coolant leaks out a little. This has only happened since sticking on a nismo uprated Rad Cap (1.3Bar pressure instead off 0.9). Rod said dont worry about it they can fix it sometime but means turbos off to do it. Perahps a word of warning to anyone thinking of fitting one for bling factor... Mine was for track days honest ;-)

10th October 2008, 06:26 PM	#3 (permalink)
bernmc GTROC Member Join Date: Dec 2006 Location: Lichfield, inna Cattle Shed Posts: 1,175	I always get mixed up between RB and RK Tuning, but one of them can supply a ceramic additive - basically empty rad of coolant, flush until its clear water. Pop in the additive and drive around for a few days. the chemical reacts with air and hardens, so seals up the porous bits without sealing the whole block up . FLush it all out after a few days, add water and coolant and you're off again. __________________ Nissan 350z NISMO and Skyline GTR33

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10th October 2008, 05:40 PM	#2 (permalink)
GouldyGTR GTROC Member Join Date: May 2008 Location: Somerset Posts: 197	i think it would have been gone anyway mate but maybe the extra pressure has set off the leak a bit more?

10th October 2008, 08:03 PM	#4 (permalink)
ExScoobyT GTR Register Member Join Date: Jan 2004 Location: `down sourfff Posts: 1,043	Its fairly common, my old block did it. Coolant additive is unlikey to fix permanently. Turbo off, clean area completely and grind slightly with a dremel, then use some `JB Weld` liquid metal over the area. This should provide a good repair. Dont use other makes of liquid metal as JB weld has higher thermal stabilty (250 - 300C Vs 120C of other types)

14th October 2008, 08:05 PM	#5 (permalink)
chaz_r33_gtr GTR Register Member Join Date: Aug 2005 Location: Lancashire Posts: 277	Thanks for the info. Rod mentioned the ceramic stuff on the outside of the block to fix it.. hence dont worry about it.. The only cost really is the labour messing about taking turbos off etc.. Is it likley to get substantially worse over the course of say 4000miles? Currently im losing an expansion tanks worth after a few weeks of driving say 1000 miles. (Im keeping an eye on my coolant levels very reguarly).. just give me a bit of time to save up if its going to continue using coolant at this rate

16th October 2008, 10:37 PM	#6 (permalink)
2rismo GTR Register Member Join Date: Jun 2006 Posts: 55	Uprated radiator caps can show up other weaknesses in the cooling system. Haven't really heard of this happening much before with RB's though. Get it fixed ASAP but if it's only weeping and not dribbling out then it's probably okay for a while.