Jump to content
SAU Community

Suss Piston

180or200

By 180or200,
in Engines & Forced Induction

 Share

Recommended Posts

180or200 Proficient

180or200

Posted
Posted

Hey guys

my 25 turned into a kettle Friday night, head gasket blew, looks like its been on the way for a while, little bit of corrosion on the block under the gasket, looks like the metal ring on the gasket has caught the edge of the piston, not sure if i should pull it down and go for broke or just fit a better gasket and see what happens!! has anyone seen this before?

post-34685-1244983633_thumb.jpg

Link to comment
https://www.sau.com.au/forums/topic/274707-suss-piston/
Share on other sites
The Dan Grand Master

The Dan

Posted
Posted
Hey guys

my 25 turned into a kettle Friday night, head gasket blew, looks like its been on the way for a while, little bit of corrosion on the block under the gasket, looks like the metal ring on the gasket has caught the edge of the piston, not sure if i should pull it down and go for broke or just fit a better gasket and see what happens!! has anyone seen this before?

post-34685-1244983633_thumb.jpg

If that's the inlet side, it looks like the beginning of a piston melting.

Have you looked at the gasket in the same position to see if it also has similar damage? Usually the stocko head gasket will let go if detonation has been an issue for some time and the piston can cop some damage from the detonation but not before the gasket blows.

Link to comment
https://www.sau.com.au/forums/topic/274707-suss-piston/#findComment-4656086
Share on other sites
The Dan Grand Master

The Dan

Posted
Posted

Righto, well it won't be a melted piston. Considering the damage on the gasket and the limited amount that can be seen on the piston, if it were my car, I'd be pulling the engine out and replacing or repairing it.

You could leave it if you wanted to but only the magical pixies know what damage could occur.

Link to comment
https://www.sau.com.au/forums/topic/274707-suss-piston/#findComment-4656140
Share on other sites
Duncan Grand Master

Duncan

Posted
Posted

has the motor recently been rebuilt? piston looks very/too clean? was the gasket the right size for the bores if it is overbored? did you use both of those alignment thingies that sit around the head bolts

personally I would pull it apart for sure. they may be able to save the piston with some light machining but you don't want it scraping up and down the bore looking like that.

Link to comment
https://www.sau.com.au/forums/topic/274707-suss-piston/#findComment-4656349
Share on other sites
Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

if you move the piston down the bore can you see any scores or marks ?

I would be pulling this engine appart regardless. I would dare say the rings are cracked as well.

The piston is very clean because this is a E85 engine :banana:

Link to comment
https://www.sau.com.au/forums/topic/274707-suss-piston/#findComment-4656363
Share on other sites
180or200 Proficient

180or200

Posted
  • Author
Posted
has the motor recently been rebuilt? piston looks very/too clean? was the gasket the right size for the bores if it is overbored? did you use both of those alignment thingies that sit around the head bolts

personally I would pull it apart for sure. they may be able to save the piston with some light machining but you don't want it scraping up and down the bore looking like that.

she's all factory, so i'm sure the gasket was the right size.

if you move the piston down the bore can you see any scores or marks ?

I would be pulling this engine appart regardless. I would dare say the rings are cracked as well.

The piston is very clean because this is a E85 engine :banana:

cant see any scores on the bore at all, just a few water marks, it is cleaner than the rest, most likely the steam and un-burnt e85 cleaning it!

Link to comment
https://www.sau.com.au/forums/topic/274707-suss-piston/#findComment-4656432
Share on other sites

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

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

      By Duncan · Posted

      To follow up a question from earlier too since I had the front bar off again (fking!) This is what is between the bumper and the drivers side wheel And this is the navigator side, only one thing but its a biggy! So basically....no putting coolers in the wheel arches without a lot of moving other stuff. Assuming I move to properly race prepping this car I'll take that job on and see how the computers respond to removing a whole bunch of ADAS modules
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      So I prepped the car for another track day on Wednesday (will be interesting to see coolant temps post flushing out and the larger reservoir, with a forecast of 3-14 being 20o cooler than last time I took it out). Couple of things to mention; since I am just driving the car and not taking a support vehicle, I took the rear seats out and just loaded the back up Team Trackday style. Look at all that space! To cover off removing the rear seat....it is weird (note the hybrid is probably different because it wouldn't have folding rear seats) Basically, you remove the lower seat base, very similar to a r series but it is a clip that pulls forward to release the base rather than it being bolted down. Easy Then, you need to remove the side section of the rear seat on each side. There is a 14mm head nut at the bottom of the side piece, the it slides upwards off a hook at the top to release; you also need to unhook the seatbelt from the loop at the top. Then the centre piece is weird. You need to release/fold the seats forward with the tab in the boot on each side From there, there are 2,x12mm headed bolts holding the rear of each seat to the folding bracket, under the trim between the rear seat and the boot (4x christmas tree clips there, they suck). The seat is out but you can see where the bolts attach to the bracket
    • RP1421
      S15 Spec R

      By RP1421 · Posted

      As discussed in the previous post, the bushes in the 110 needed replacing. I took this opportunity to replace the castor bushes, the front lower control arm, lower the car and get the alignment dialled in with new tyres. I took it down to Alignment Motorsports on the GC to get this work done and also get more out of the Shockworks as I felt like I wasn't getting the full use out of them.  To cut a very long story short, it ended up being the case the passenger side castor arm wouldn't accept the brand new bush as the sleeve had worn badly enough to the point you could push the new bush in by hand and completely through. Trying a pair of TRD bushes didn't fix the issue either (I had originally gone with Hardrace bushes). We needed to urgently source another castor arm, and thankfully this was sourced and the guys at the shop worked on my car until 7pm on a Saturday to get everything done. The car rides a lot nicer now with the suspension dialled in properly. Lowered the car a little as well to suit the lower profile front tyres, and just bring the car down generally. Eternally thankful for the guys down at the shop to get the car sorted, we both pulled big favours from our contacts to get it done on the Saturday.  Also plugged in the new Stedi foglights into the S15, and even from a quick test in the garage I'm keen to see how they look out on the road. I had some concerns about the length of the LED body and whether it'd fit in the foglight housing but it's fine.  I've got a small window coming up next month where I'll likely get a little paint work done on the 110 to remove the rear wing, add a boot wing and roof wing, get the side skirt fixed up and colour match the little panel on the tail lights so that I can install some badges that I've kept in storage. I'm also tempted to put in a new pair of headlights on the 110.  Until then, here's some more pictures from Easter this year. 
    • joshuaho96
      R32 GTS (RB20DE) Injectors Replacement

      By joshuaho96 · Posted

      I would put a fuel pressure gauge between the filter and the fuel rail, see if it's maintaining good fuel pressure at idle going up to the point when it stalls. Do you see any strange behavior in commanded fuel leading up to the point when it stalls? You might have to start going through the service manual and doing a long list of sensor tests if it's not the fuel system for whatever reason.
    • perry_r33
      R34 GTR Vspec Garage Sale - All must go!

      By perry_r33 · Posted

      Pm sent 
×
×
  • Create New...