Bought a mk1 frs engine this week which was smoking.
Took head off to find det marks all over edges of pistons 2&3.

Are these scrap now ?
I know they don't look too clever but does that mean scrap ?
What's my options here
Cheers
Steve

 

i certainly wouldnt use em, i bet the sides aint to clever either, maybe even blown by the rings already

put a bit of oil in each pot with the pistons all half way down and see if it pisses thru or holds tight

 

i wouldnt either

 

They have had it m8.

 

Wonder what got in there to cause that?

 

TBH unless the ring grooves have been closed up, they would probably go again and run just fine, so it would depend on the application.

Certainly not something "nice" to have in your engine though.

 

Oil wont get past, you need to use something thinner like white spirit for that sort of test.

 

In the bin i thinks.

 

To be honest, the position of that damage, I'd be worried about the bores too!?

 

Can they be skimmed ?

 

ive never had trouble using oil, i use the left overs from my fireblade servicing, i had a cvh in my garden i used oil for it showed 3 was down so its a garden ornament because my wife cant lift it to bin it

 

Would have to be very poor seal for oil to get past unless you left it a very long time.

 

fuck me chip ill do as i like stfu

 

I would be looking for summit to replace them with tbh....

 

oil down bores will show significant ring/bore wear.
to be fair, pop the pistons out and look for scoring on the skirts and bores.

 

sell them to mo as low compression!

 

Dont be a skimp mister get some new ones and turn them into ash trays what dose the head look like ?

 

tbh would you be happy knowing thats in your engine? bin em!!!!!

 

so long as the bores and sides of the pistons are ok then i would clean them up with a file and reuse them, ive refitted much worse!
i put some back in an rs turbo once for a mate that i had to pick bits of a valve seat out of before i could fit them lol, its still going strong now at over 20psi

 

as long as that's all the damage should be okay just clean them up with a filed or a die grinder,and about oil down the bores i've always been told to use thinners

 

Given that it's all out of the car... I'd whip them out, check and clean up the block then fit some nice shiny new pistons for peace of mind. No point pissing around and doing this kinda shit half assed pikey style IMO.


Cheers,
Grant

 

No need for that comment... Just because someone has an opinon that you do not like...

 

it depends on application. as an example on our cat d8s work approx 2000 hrs a year which would equate to around 80000 miles a year in a road vehicle, and they run at flat out revs all day, when i rebuild the engines i fit new pistons regardless as although they are still good condition they will fail before the next engine rebuild is due causing a premature failure, but in your case if the damage is all above the top ring they could be cleaned up and used again if you decided you wanted to, must be filed up though so as not to damage the bore, in saying that if it its damaged it will have probably already damaged the bore anyways.

 

They must be removed or a proper inspection., and I doubt pistons are so expensive, that it isnt worth buying new ones ?

 

Why did u buy a fucked engine in the first place?

 

I imagine there will be some serious piston issues if they had that much det over them. Whip them out and I expect you'll be seeing the pistons cracked between the rings!

Matt

 

I didn't.
I bought an engine which I believed needed piston rings.
Wasn't so lucky though

 

Sounds like someone selling a car with non working aircon..... "yeah mate works 100% just needs a regas"....

 

New pistons + a new engine map.

 

Cant see any signs of det on those pics TBH, just debris.

 

Whenver I see a "it only needs..." type line in an advert I always make the assumption if they really believed that they would just do it themselves so they could sell the car as working!

 

The other 1 is....... "smoking a bit just needs a set of stem seals"....lol