Jump to content
SAU Community

Crank Bent?need Info

700HP-GTR33
 Share

Recommended Posts

700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted

Hello all,

I have a noise coming from the front harmonic balancer...looks like it is rubbing.

The clutch (pulse)vibrates as I am taking off...

Is it possible I have bent my crank?

Or have I a faulty harmonic balancer?

New harmonic balancer fitted 12 months ago.

Cheers

Link to comment
https://www.sau.com.au/forums/topic/236031-crank-bentneed-info/
Share on other sites
Duncan Grand Master

Duncan

Posted
Posted

yes it could be a bent crank. if you put the car on stands and start it you would be able to to see the balancer move - even 1mm is bad news. or to be more accurate, pull the balancer off and check the run out with a dial gauge.

we had a 33 with a bent crank, the nose of the crank was only moving by .1mm or something like that but it still flogged the bearings out.

why did you fit a new balancer? And are you certain the balancer bolt is tight?

700HP-GTR33 Mentor

700HP-GTR33

Posted
  • Author
Posted

Thanks for the reply,

I had front seal problems when I first got the car.

Had the seals changed 3 times until I suspected the oil pump.

Sure enough after the pump was changed no more problem.

The balancer came off and then put back on a few times.....causing the key to break

and cause my balancer to chip.

We replaced the Balancer last year this time....everything is still tight.

My workshop has not pulled it out yet to see what the problem is...but am suspecting the worst.

How did you fix the problem?

Duncan Grand Master

Duncan

Posted
Posted

you really don't want to know ;) full rebuild, new crank and probably new block as well because it really flogs out the bearings and tunnel.

given that you have had seals, balancers etc damaged, it really does look like you had a bent crank all along. get the workshop to check with a dial gauge, but they really should have checked it already given the number of problems you have had

  • 2 weeks later...
700HP-GTR33 Mentor

700HP-GTR33

Posted
  • Author
Posted
what exacly was wrong with the old oil pump?

The pump had been punished by the slightly bent crank all along.

Might have worn the side walls near the seal.

.

Anyway...thats ok now...cause engine re-build time ;)

Was knowing it would come to this...just not knowing how soon.

Crank bent, .7mm out ..tried a second hand harmonic balancer to make sure.

Hope I don't need a new block.......would love to use mine.

700HP-GTR33 Mentor

700HP-GTR33

Posted
  • Author
Posted
block should be OK but will need to be checked out. It might require a tunnel bore to be straight again

Underway as we speak.

But am going 86.5mm Pistons so bore and hone.

Thanks all for your input. :nyaanyaa:

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

    • soviet_merlin
      Duncan's V37.......race car?

      By soviet_merlin · Posted

      Thanks for doing that Duncan! Makes you a good person in my books. We don't get kangaroos or wombats here. But we have bats and it's similar. AFAIK it's often the mums with a baby attached that get hit because they drop lower when starting from a tree. If you hit an animal, check on it. https://www.ifaw.org/au/resources/wildlife-rescue-app An app to get the closest wildlife rescue contact.
    • Murray_Calavera
      Jacks that fit under GTR lips that can reach the subframe?

      By Murray_Calavera · Posted

      My dream is also to have a proper hoist, but I don't think it will ever happen. My quickjack is probably as close as I'll ever get, it really is very good though. 
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      Yeah we keep on in the dailies, it is pretty poor how many animals get hit and the driver leaves without checking....have saved a couple of little ones over the years. Bit of a gruesome job though, pouches generally need to be cut open because they are so tight and often the joey doesn't realise mum is gone so they are still locked onto the teat. I checked the modules in front of the DS wheel where an oil cooler should go.... There is the radar unit - that can go for race use) One of the 2 HX water pumps, the silver cylinder. That needs to be kept but might be able to be relocated But the bad news, the big computer mounted vertically in front of the wheel (blocking any potential air exit) is the electric steering computer. That is required until/unless i do a hydraulic steering conversion, and in CAD based modern car design it is not like I can just pop a big unit like that somewhere else (plus the loom would be too short anywhere else too). So, the passenger side is OK to clear out (just use a smaller washer reservoir, potentially elsewhere), but the DS no beuno
    • Duncan
      Chris' Toyota Mark ii JZX110

      By Duncan · Posted

      Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
    • Duncan
      Jacks that fit under GTR lips that can reach the subframe?

      By Duncan · Posted

      BTW I measured the jack I have, it is 70mm at the saddle but you only have about 700 until it returns to 150mm high at the cylinder so it is good but no magic bullet.
×
×
  • Create New...