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Knocking From Gtr Engine

Dr GTR

By Dr GTR,
in Engines & Forced Induction

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RB20JT Rising Star

RB20JT

Posted
Posted

sorry guys,

just thought i would ask while ur discussing....my mates got a top end knock (well i think it is) in his r33 rb25, so u reckon its cause the valves dont seat then they have too much clearance and you get the knock at top of engine?

if so....wats the best thing to do to fix it? and how much?

cheers guys,

Dr GTR Rookie

Dr GTR

Posted
  • Author
Posted

My mechanic is due to come over in the next hour or so so should have a good idea. He swaers that it cant be the big ends as we only changed them about 2 months ago along with a new R34 crank which was balanced etc. That was due to a dodgy nissan oil filter which decided to pack up. We are going to pull the cam covers off and chack for any obvious faults...If its not that then our worst fears will be confirmed. Take b100dy engine out again and look for obvious faults.....My history of skyline ownership has never been good dammit........Will keep you posted.

RB20JT to re-seat the valves is not a major job but in terms of cost i really dont know what the prices are like in Australia but when you do find out let me know as it looks like i will be moving to Sydney within the next year on a job transfer and would like to know what the prices of ownership are like in Oz. Which reminds me, i will post a few questions on how easy it is to bring my car over.

Gerry

Dr GTR Rookie

Dr GTR

Posted
  • Author
Posted (edited)

Ok

My mechanic had a really good look at the car and listened with a stethascope as well as carrying out compression test and all seems sweet. The knock seems to be coming from the valvetrain and it seems that it needs re-shimming and some other small bits. Its not the end of the world and its not going to cost $thousands. At least its safe to drive but the downside is that the cams are starting to wear a little faster than i want them to.

I suppose thats the price i have to pay for running 700bhp.

Gerry

Edited by Dr GTR
SLIPPERY Experienced

SLIPPERY

Posted
Posted

Did what solve the problem?

The mechanic diagnosed the problem. In his case, the shims most likely need adjusting which he was going to live with

Your scenario would be different since you run hydraulic lifters. The noise may be fixed/lessened with different oil, 'lifter free' solution, the lifters re-bled or worst case, replaced.

Dr GTR Rookie

Dr GTR

Posted
  • Author
Posted

Tuner has said that i need new shims. I am running 640bhp so parts will wear out sooner rather than later lol. Anyway i am living with the noise for the time being until he has time for the car to go in for the works. The noise comes and goes depending on how often i drive the car as petrol in the UK isnt exactly cheap at the moment. Something like $2.10 for 1litre and it just drinks it. I should drive it more really.

Gez

deant1 Collaborator

deant1

Posted
Posted

I can second that. I moved to adelaide from middlesbrough (north east of england) about a year ago now.

And aussies always complain when petrol gets over $1.20 heh. Just look at what you pay in england!!! when i left it was 97p which is like $2.30...

Enjoy ur fuel aussies cause it's cheap if you think it is or not.

Oh and when u get here you'll notice cars look after themselfs allot more (no salty wet roads) although i say this during the middle of a thunderstorm but this doesn't happen often.

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