Rb30 Twin Cam Top Dead Center For Crank Shaft

[BMYHOE]

Hey Guys,

So i just brought a R33 GTST with a RB2530 in it, the wedge holding the harmonic balancer has come loose and stuffed the crank so im in the process of replacing the crank. have the other one getting balanced etc..

so before i started pulling everything down i had the motor at TDC, but after lossing the flywheel bolts i have turned the motor almost half a turn without realising.

THEN i removed the timing belt without marking it on the belt,crank or cam gears.

so now i have the belt off and the tdc markers on the cam gears facing: inlet: 4PM outlet: 8AM

just woundering if i should re install the belt?then turn the motor to TDC?

[zebra]

If you are srtipping the motor why are you worried about TDC?

[The Mafia]

No need mate. There are dots you line up on the crank, and cam gears. Just line all the dots up and slip the belt on.

I urge you to check it 10 times and have a smart mate look and see if the dots line up good. I had my iPhone down there taking pics of the crank dot because you can't get your head down there to look at it straight on.

Once all the dots are lined up, slip the belt on and problem solved.

You shouldnt really use marks and hop it goes on in the same place anyway, that's just being hopeful, and not good practice.

[BMYHOE]

If you are srtipping the motor why are you worried about TDC?

i am just changing the crank so i didnt want to pull the head apart. i guess ill take the rocket covers off and just put the cams at TDC before re instaling the crank.

so is there any marks on the crank for TDC?

do i use the key wedges for the pulleys or is there marks on the pulleys them selfs?

sorry for the noob questions just wanna make sure things are right,

thanks

DAN

[zebra]

Is the head off the block?

[BMYHOE]

no motor is still compete just sump, flywheel and crank timing sprocket removed..

[zebra]

you are going to have trouble tightening the rod bolts up with out being able to rotate the crank, might be do-able, but its the difficult way of doing it.

[r33_racer]

Just use a dial indicator to find exact tdc with number 1 if you have one. Or use the marking on the timing gear to line up with the notch in the oil pump housing. Then use the cam gear dots to line up with the markings on the timing cover backing plate.

Usually tdc is is when the key slot for the woodruff key is facing up.

[zebra]

Or be dodgy like me and use a pen down the #1 plug hole to get it as close as possible and adjust to get everything lined up.

I dont suggest that method though...Dial gauge is much better

[JonnoHR31]

no need to take the rocker covers off, just leave the cam gears on and line the dots up to the marks on the rear timing cover. if you turn the crank roughly 60 degrees past tdc you can turn the cams without any risk of piston to valve contact

[D_Stirls]

Whip the cams out and then spin the crank to your hearts content, that way while you are putting the engine back together you don't have to worry about any unforeseen piston on valve action.

Edited October 15, 2011 by D_Stirls

[Guilt-Toy]

did your old rb30 crank have a collar fitted?

if so can you take pics of the snout of the crank of the new crank and the old one.

I might be able to pinpoint WHY this happened and save it from happening to you again a second time. Changing the crank and not investigating WHY it happened is not the right way to go about it if you don't want it to happen again.

let me know if you want my help.

[BMYHOE]

thanks guys!

im getting my new crank back on wednesday, then ill get you some pics guilty.

what do you think could of been the cause?

Edited October 21, 2011 by BMYHOE

[Guilt-Toy]

i have an idea.. and it happened to me before....

crank bolts DONT come lose on their own.

just make sure you send me the pics before you put it back together. pm me if i dont see them straight away.

thanks guys!

im getting my new crank back on wednesday, then ill get you some pics guilty.

what do you think could of been the cause?

[BMYHOE]

ill have some pics up on friday night,

[Guilt-Toy]

?????????????

[BMYHOE]

Sorry mate been busy ...

this is the f'd crank

this is the new crank

i didnt get any more pics of the new crank, hopefully that will help you.

we think that this was all caused by the harmonic balancer bolt coming loose..

Edited November 1, 2011 by BMYHOE

[Guilt-Toy]

its not clear man... cant see shit