Jump to content
SAU Community

Will An Rb With Bent Valves Start?

chef_stagea

By chef_stagea,
in South Australia

 Share

Recommended Posts

D_Stirls Veteran

D_Stirls

Posted
Posted (edited)

Do after you changed the belt do the gears match up with the marks when the balancer is at 0?

It will still run as you will still get some compression but it won't run well. If they are overly bent or you have knocked the head off the valve that cylinder won't fire.

Edited by D_Stirls
chef_stagea Grand Master

chef_stagea

Posted
  • Author
Posted

Madaz. See stag section for full report, I think basicly what's happened... The belt came off, I aligned the can wheels, then moved the crank wheel around to it's mark. I used a breaker bar on the harmonic bolt... I think me forcing it round( thinking it was just compression lock up... May have bent valves, not knowing what I'd done I put it back together and started it, sounded real exhaust leakish... I should have left the belt on and span it witch I wasn't aware/ think of then!

D stirls, yep all lined up, but I made it line up by forcing it to, witch I think is when I 1st bent stuff...

Do after you changed the belt do the gears match up with the marks when the balancer is at 0?

It will still run as you will still get some compression but it won't run well. If they are overly bent or you have knocked the head off the valve that cylinder won't fire.

chef_stagea Grand Master

chef_stagea

Posted
  • Author
Posted

Yeah but how am I going to a compression test? I can't keep cranking it over. Or is it ok Ish if it's not firing...? What's new valves and sleeve going to cost?? And how much time to swap lol

Yeah you really shouldn't force things

Time for the had to come off then.

Do a compression test and that will tell you the story. And then if it's low, off with the head, new valves and guides.

D_Stirls Veteran

D_Stirls

Posted
Posted

If it's lined up now then you should be able to turn it over without doing anymore damage than what has already been done. Hopefully you don;t drop a valve in the process. But without a compression test you might pull the head off and there will be nothing wrong (unlikely though).

chef_stagea Grand Master

chef_stagea

Posted
  • Author
Posted

Ok will do. So just unplug cas n go each cyl. Is it likely 2 be more than 1 cyl u rekn,

And I'll have to do all 24 valves, and all sleaves go them, anything eles? Just go stokies again? Do 26 ones fit? Likely to have piston damage?

If it's lined up now then you should be able to turn it over without doing anymore damage than what has already been done. Hopefully you don;t drop a valve in the process. But without a compression test you might pull the head off and there will be nothing wrong (unlikely though).
D_Stirls Veteran

D_Stirls

Posted
Posted

Pull all the plugs as well. Take the fuel pump fuse out and unplug the injector loom.

If you only forced it through i rotation (probably only 180 degrees) then it won't be more than 2 sets damaged (off the top of my head).

You might as well replace all the guides as you will have a fully rebuilt head then , and if you are going to chase some performance down the track get the head lightly ported while it is off. The valves will be the expensive bit (i suspect). Just to give you an idea i ordered a full set of guides form my CA for $120 + postage from the states.

chef_stagea Grand Master

chef_stagea

Posted
  • Author
Posted

Yeah ok, guess I'll give it a crack... The compression test will me how many sets are gone... I'll just pm you when the head comes off as to what I'll need, fairly upsetting cox it's my daily!!

Pull all the plugs as well. Take the fuel pump fuse out and unplug the injector loom.

If you only forced it through i rotation (probably only 180 degrees) then it won't be more than 2 sets damaged (off the top of my head).

You might as well replace all the guides as you will have a fully rebuilt head then , and if you are going to chase some performance down the track get the head lightly ported while it is off. The valves will be the expensive bit (i suspect). Just to give you an idea i ordered a full set of guides form my CA for $120 + postage from the states.

Tangles Grand Master

Tangles

Posted
Posted
a leak down test would be 100% accurate.

either way.. a breakerbar on the crank is a no no with no timing belt on.

yup means valve has hit a piston, and been bent from the forces exerted on it

as per sms Ive got a set of Neo intake/exhaust valve seats for you here, brand new

boostin32 Enthusiast

boostin32

Posted
Posted

As topic says, I rekn I've bashed up my valves, will the car start with them bent? I thaught no due to nonconpression, but the car does start... Super raggedy tho!

chef have u still got that timing belt n stuff for sale ???

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Dose Pipe Sutututu
      Dose's Sometimes DIY and Pay Someone Home & Boat Improvement Thread

      By Dose Pipe Sutututu · Posted

      Wife wanted basket things in the wardrobe in our temporary house. Thought about ripping our the wardrobe and fitting the entire IKEA set, but it's a temporary house and we want to move in a few years. So IKEA advertises this as a 50cm unit, however the actually basket and rails measure 46cm wide. Only issue was depth, IKEA stuff is quite deep, where as the builder special junk is super shallow at less than 40cm. Send it, chopped the rails, then offset the mounting holes, job done, happy wife, less shit scattered all over the bedroom. Did the same to the other side too. Also drove the Skyline shit box today, dropped off oil at Supercheap Auto. I didn't realise they only now take max 2x bottles per visit. I visited 2x Supercheap Autos.  
    • Kinkstaah
      Strange issue RB25DET wont start

      By Kinkstaah · Posted

      I've seen similar actually in my situation. You never know what tables are attempted to be used when the car thinks it's -99C or +200C. The fail state is not usually that extreme but you know what I mean - it was in my case though! This is where being able to read all the sensors is useful cause you see this stuff really quickly.
    • Kinkstaah
      First time Skyline owner

      By Kinkstaah · Posted

      The above is very important. However as long as you keep timing relatively low, it's plausible to make your own knock ears and plausible to learn to tune with a modern ECU that can do wideband O2 correction like a boost controller. I mean if you only have one viable road to even drive the car on, learning to tinker to this level may be worth doing given you can't do much else with the car...?
    • Kinkstaah
      Chris' Toyota Mark ii JZX110

      By Kinkstaah · Posted

      I find the fact that the rear plate has to be bent inwards at the rear not so bad: but the front is just awful: It's like come on. (these are my very old, now retired/turned in plates) TBH it is a lot of money to fix a minor issue, the fact I said "I'll never really spend the money on doing this" is why people ended up buying them as a gift for a 'car guy' who can be hard to shop for.. for car guy things.
    • GTSBoy
      Chris' Toyota Mark ii JZX110

      By GTSBoy · Posted

      I just bent the ends of my premo plates. It even went through Regency like that after the engine conversion and the inspector (a great bloke!) just squinted his eyes and said "I didn't see that". Plates, and how they look, are just something that have zero importance to me.
×
×
  • Create New...