Jump to content
SAU Community

Recommended Posts

Hi all,

After a bit of advice on a head that I sent away to have some machining done on. The head has passed a pressure test ok but the combustion chamber appears to have a couple of cracks between an inlet and exhaust valve on cylinders 5 and 6. The engineering company have ground away the surface a bit to check to see if it was a surface crack but it appears to go deeper as shown below :

p1020876.jpg

p1020877t.jpg

Frankly, I spent ages porting the ****ing thing before sending it away so is it repairable or ?

Edited by mambastu
Link to comment
https://www.sau.com.au/forums/topic/408616-cylinder-head-cracks-repairable/
Share on other sites

To repair it you'd have to gouge it all out, bake the head to remove impurities, and weld the entire affected area up, provided it was even possible, then you'd have heat effected area near weld, then you'd also have stresses built in to it. I wouldn't be keen on repair.

It's a shame you're in the UK, because if you were in Aus I'd suggest sending it to someone here in Adelaide that could pretty near build you a complete new head out of welding rod. FWIW, that head looks completely repeairable, but you'd need to find someone trustworthy to quote on it, because you're going to have to balance the amount of work and money required to pull the seats and guides out of those chambers and do all the prep, weld and refinish against the amount of time/money/effort you have otherwise sunk into the porting and anything else done to the head.

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

    • A few small updates since the previous post and lessons. I decided to do a little interior light upgrade on the 110. I quite like the iilumo items, even if they're a bit of a premium over other brands. You'll also note the Stedi Fogs, that will go into the S15 fog lights as I needed to match the bulbs since I got the new ones earlier. I hope they fit as the body is quite a bit longer than your normal bulb.  Annoyingly, I managed to trip the fuse, which normally wouldn't be an issue until I located the fuse. I can't say I've ever come across this. I had lucked out that someone nearby had a spare, but oddly enough Toyota dealerships seem to keep this in stock. I ordered some to keep in my stash and as luck would have it, someone else nearby tripped the same fuse so I passed on the favour.  I also did a little service on the 110 ahead of some additional work coming up. It's been annoying that Goleby's stopped carrying this particular HKS filter for the 110, so now I need to keep them on order from Japan. I also took the opportunity to install a bash plate and number plate riser. The plate riser is such a cheap but nice fix to help really tidy up the car. I'm tempted to now also replace my headlights, on this car. Both items were from Project Aero.    I also needed to replace the rear tyres on the 110, and after trying to get it aligned learnt that I need to replace some bushes in the front end, so that's next.  Closing out this update with a nicer picture as always! 
    • Yeah mate, never miss it.
    • Any going to watch World Time Attack at SMSP this year?
    • Appreciate the correction on the "ground", that will make a huge difference to looking at this. That makes complete sense about AF70/AF71 which is what I had come down to being the issue, one of these. I'll have another look in the ignition wiring when I get a chance next week. I'll also make up a jumper wire for running that AF73 test.  ECU is fine, relay itself is fine, pump harness is fine and the pump itself is fine. I am going to upgrade the Walbro 255 anyway with a DW300 I have since I need to replace the fuel sender and I'm going to upgrade the FPR with my chasebays kit ready for new plenum/injectors/dbw, but I'll get this working first. That's why this is so frustrating. 
×
×
  • Create New...