Jump to content
SAU Community

Recommended Posts

I changed a timing belt on an RB25DET for a family member and unknown to me, a spacer or collar (what ever it was) found it's way where it didn't belong :D .

This caused the inlet cam to become retarded by 2 teeth and the exhaust cam to advance 2 teeth.

Resetting the cam timing and the engine to runs like a bought 1 (it wouldn't start befor).

The obvious question is, was there any potential to have damaged valves/pistons?

My main concern is that the boost gauge is showing about 11" mercury when idling. This seems low to me but I never paid any attention to the gauge pre busted cam timing.........

Other than that, engine is smooth as silk with a rock solid idle speed.

Link to comment
https://www.sau.com.au/forums/topic/191413-chance-of-valve-damage/
Share on other sites

i would say no... several teeth out wouldnt be enough to do any major damage, trust me you'd hear the valves touching the pistons when you first crank it over :D

Cheers. Like I said it's only the low idle vacuum that bothers me, but that could be a dud gauge or crap hose.

Cant really comment on the 2 teeth you picked up but ide say if the changes were made from TDC then you should be ok (considering how much *safe* adjustment you can get out of adjustable gears)

What exactly did you do to cause the problem? I only ask because I have a 25 and a 20 here both awaiting a new belt so I dont want to make the same mistake

Cant really comment on the 2 teeth you picked up but ide say if the changes were made from TDC then you should be ok (considering how much *safe* adjustment you can get out of adjustable gears)

What exactly did you do to cause the problem? I only ask because I have a 25 and a 20 here both awaiting a new belt so I dont want to make the same mistake

Somehow a steel spacer that I can only guess was from the timing belt cover got in behind the timing cover. I found it sitting between the cover and the tensioner roller. I think we (I) were very lucky, and propably the only thing that prevented major engine damage was because the owner was (suppose to be :rofl: ) taking it easy due to a dud fuel pump.

Belt replacement is quite straight forward, just leave out any and all small and large belt wrecking items and it will all be sweet :D

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Well, I'm not clicking on a link to f**king bookface (never have, never will), so I can't really know what the complaint here is about, but.... There's nothing particularly wrong with forcing people to have a higher license category to drive super/hypercars. Note that the laws are not about modified cars - only listed standard cars, because there are not supposed to be cars modified enough to meet the law's category limits anyway. If you have a modified car that falls into those power limits you're already in trouble anyway. What is wrong is the bullshit on-line "test" to get the upgrade, instead of any actual work and training.
    • Meh Don't have Facebook anymore but watched a YouTube about it, they also talked about them not being able to use and "sports" modes, not really sure how they would enforce that apart from logging the Db for the cars that have exhaust valve activation in sports mode Apart from all the high end sports cars and supercars that make the sort of power they are talking about standard, I cannot see it bothering anyone else, unless of course road side tests now include having a dyno and scales on site to test the power output vs weight What is it? 500hp per ton? And if the only additional cost is $60 or so, as the video stated, I cannot see that being a war stopper for the people that outlay a few hundred thousand dollars on a performance car In fact, I see it would be a ego boost for some, because they have a "special" drivers licence for a "special"person with a "special" car And if I did have a modified car that made over the limit, there's no way in hell I would apply for a "special" licence, I could see the authorities checking your licence against your rego, so if old mate applied for a licence, but owns a, say, R33 Skyline, that may trigger an inspection of said car as to why, and how, that old mate has a R33 that would fit the bill of making over 500hp per ton Again, meh, not something I believe will be a real issue to 99.9% of people
    • https://www.facebook.com/groups/mechanic.com.au/permalink/2029367984190485/?   Here we go…. 😢
    • Hi, I'm a new member who has been lurking for a while. Ive been looking to buy an R32, 33 or 34. GTT/GTST for some time now. I'm close to pulling the pin on one,. My question is around roadworthy certificates in Victoria. What can you get away with as far as mods go?  Would a car pass RWC with a haltech dash, aftermarket manifold and high mount turbo as long as ride height and noise was ok? I come from a muscle car background, I'm learning more about our beloved Skylines as I go. I don't want to drop my savings on something to find out I need thousands to get it on the road. Cheers for any input/advice.  
    • The first year I did Putty Road I was driving the old Honda Jazz work car. Being the rear vehicle of the 2nd or 3rd group to make sure no one got lost. The GTRs in front couldn't work out how I "was with them in the twisties"... They didn't like it when they found out I was only cruising and chilling in the Jazz like it was a Sunday drive with my Nan in the car.
×
×
  • Create New...