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Tomei Cam Gears And Cams, T-Belt Position?!

hybrid_eg
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hybrid_eg Enthusiast

hybrid_eg

Posted
Posted (edited)

Hello gents,

I wanted to get some feedback related to the pics.. so just recently completed a full R33 rebuilding.. i've included Tomei cam gears and poncams.. the only problem visually I appear to have is the fact that Timing belt is about 1mm off the cam gears closer to the radiator. Tbelt does not appear to be walking as i've taken it all apart again to check the bottom pulleys and all is in check.. belt is in-line with all the side covers and doest move around, it just that it sits a nudge past the edge.

Anyone else encounter this? Prob is i never took a pic with OEM cam gears to see how it sat and measure the gears for comparison purpose.

All feedback is appreciated!

Tks!

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Edited by hybrid_eg
DVS JEZ Grand Master

DVS JEZ

Posted
Posted

I think the idler is missing the washer that sits behind it. Do u remember fitting this washer?

If u have a good look the idler pulley will be sitting closer to the head than the rest of the pulleys.

34GeeTeeTee Grand Master

34GeeTeeTee

Posted
Posted

I thought the poncams were dialled in and were best suited to the stock position eliminating the need for cam gears? I could be wrong as i am mildly retarded but just thought thats what i had read?

EdGTR Enthusiast

EdGTR

Posted
Posted

Hey, you know what they say if it doesnt look right then it probably isnt and that doesnt look right.

Pull the front down again and recheck everything. if you have a service manual with a exploded view it will show all the washers and spacers go.

Once it is apart hopefully it will be obvious.

I have seen a few engines with the tomei gears and none have sat like this.

  • 5 weeks later...
hybrid_eg Enthusiast

hybrid_eg

Posted
  • Author
Posted

As i remember everything was installed correctly reusing the washers.. the belt is not walking its just sitting in that position. Does anyone have a picture with same set up installed to see the position?

Both cams and cam gears?

34GeeTeeTee Grand Master

34GeeTeeTee

Posted
Posted

As i remember everything was installed correctly reusing the washers.. the belt is not walking its just sitting in that position. Does anyone have a picture with same set up installed to see the position?

Both cams and cam gears?

Not the same setup, but this is my NEO and shows where the belt should sit if fitted correctly -

post-47580-0-59566700-1339547389_thumb.jpg

hybrid_eg Enthusiast

hybrid_eg

Posted
  • Author
Posted

When the belt was installed, it was even with the cam gears.. however, the motor was run, the belt centered itself in the position where it seems to be off.. (original pictures).

The washers from the FSM are all there.. so i'm not sure what gives..

34GeeTeeTee Grand Master

34GeeTeeTee

Posted
Posted

When the belt was installed, it was even with the cam gears.. however, the motor was run, the belt centered itself in the position where it seems to be off.. (original pictures).

The washers from the FSM are all there.. so i'm not sure what gives..

It indicates that something isnt lined up... The belt will generally straigten itself to the correct position as the crank gear kind of acts as a guide.... Either way, something is not right and i wouldnt be leaving it that way!

  • 2 weeks later...
DVS JEZ Grand Master

DVS JEZ

Posted
Posted

When u take the lower timing belt cover off u will notice that the idler or tensioner or both are sitting too close to the block in relation to the rest of the pulleys.

There is a washer that normally sits between the block and the idler

  • 2 weeks later...
hybrid_eg Enthusiast

hybrid_eg

Posted
  • Author
Posted (edited)

I didnt get a chance to take it all apart but took some more pics to share.. From what I can see on the manual instructions on tensioner there is only a spring in front of it.. od idler, nothing.. So i'm not sure why everyone is advising it could be a washer when its not pictured in the manual? There is a washer in front of the bolt that wil not offset distance between pulley and block.

This is weird..

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Edited by hybrid_eg
rofocale Contributor

rofocale

Posted
Posted

I've recently installed some tomei cam gears. The timing belt should definitely not be sitting so far forward. I noticed at one stage that the spring on the tensioner can actually fall behind the tensioner pulley which then makes the tensioner pulley not sit square. This can then make the timing belt move forward. Maybe the spring on the tensioner is between the tensioner and block - try checking that maybe...If you just keep cranking it over manually, the belt should stay pretty well centered. Basically something is making the timing belt 'move' forward from its standard position. The question is what...

Good luck. I would not conitnue until I had this resolved and fixed....

hybrid_eg Enthusiast

hybrid_eg

Posted
  • Author
Posted

I'm taking it apart on Thursday to check spring, and measure everything to see what gives.. also keep in mind originally I had the belt flpped the wrong way ( didnt see the mark on the Tbelt) and really thought that could have been it, when belt was reintalled it was put in the correct position, however when motor starts it moves forward.. and stays in that position.. it doesnt walk like you would see on a stretched belt..

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