My #2 piston. No questions this time. I promise.
10-22-2006, 08:06 PM
#1
Rennlist Member
Thread Starter
My #2 piston. No questions this time. I promise.
Heres the piston that has been causing me all this trouble 
You can see in the first pic where the piston was tapping the head.
Took the head to the shop and he said it was fine... Go figure.
You can see in the first pic where the piston was tapping the head.
Took the head to the shop and he said it was fine... Go figure.
10-23-2006, 02:43 PM
#2
Rennlist Member
I don't see any evidence of the piston hitting the head. How would that happen? Did you mean piston hitting the valves? Again I don't see evidence of that. The only thing I see is the piston skirt broken. That's bad. What did that do to your bore? Where'd the piece that broke off end up at?
____________________________________
1986 944 NA - Guards Red - 91k miles - minty
1983 944 NA - Platinum metallic - 4200 mi beginning a new life
1985.1 944 NA - Guards Red - donor car
1984 911 Carrera Coupe - Guards Red (gone, but not forgotten)
"If you're not living on the edge, you're not living"
____________________________________
1986 944 NA - Guards Red - 91k miles - minty
1983 944 NA - Platinum metallic - 4200 mi beginning a new life
1985.1 944 NA - Guards Red - donor car
1984 911 Carrera Coupe - Guards Red (gone, but not forgotten)
"If you're not living on the edge, you're not living"
10-23-2006, 03:07 PM
#4
Three Wheelin'
Join Date: Aug 2006
Location: Bremerton, WA
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YIKES!
I didn't see anything on the top of the piston that indicated contact (and I've blown up more than my share of engines). That busted piston skirt scares the crap out of me. That looks like something came in contact there.. otherwise how in the world did that happen!?!? I'd be looking for that metal and having the bore mic'd. YIKES!
10-23-2006, 04:47 PM
#7
Rennlist Member
Thread Starter
Yeah thats what it looks like.
But we found the broken piece in the oil pan when we took that off before the pistons even came out.
And maybe I didnt take a good pic. But there is a spot where the carbon is cleaner on the top. And it corresponeded to a clean spot on the head. They got only close enough to clean the carbon off it seems.
And the piston hit the HEAD not the Valves.... Ill see if I can find a pic of the head before I took it to the shop.
Oh and the cylinder bores were all surprisingly just fine...
But we found the broken piece in the oil pan when we took that off before the pistons even came out.
And maybe I didnt take a good pic. But there is a spot where the carbon is cleaner on the top. And it corresponeded to a clean spot on the head. They got only close enough to clean the carbon off it seems.
And the piston hit the HEAD not the Valves.... Ill see if I can find a pic of the head before I took it to the shop.
Oh and the cylinder bores were all surprisingly just fine...
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10-23-2006, 04:59 PM
#9
Captain Obvious
Super User
Super User
Wow, for the piston to come in contact with the head three had to be a huge play in the wrist pin. Can you feel the wrist pin being that loose in the connecting rod? I’m not familiar with your previous post but was the engine rattling or making weird noises?
10-23-2006, 05:07 PM
#10
Rennlist Member
Thread Starter
The wrist pins were checked at the shop and said to be within spec. I still won't be reusing it. And it didnt feel loose.
Yeah the engine was making a knock like a SOB. I should also mention that the bearing spun.
I didnt take a picture of that sadly... But both halves of the bearing were paper thin and fused together. Not to mention razer sharp. LOL.
Yeah the engine was making a knock like a SOB. I should also mention that the bearing spun.
I didnt take a picture of that sadly... But both halves of the bearing were paper thin and fused together. Not to mention razer sharp. LOL.
10-23-2006, 05:15 PM
#12
Captain Obvious
Super User
Super User
Originally Posted by Calmchaos
The wrist pins were checked at the shop and said to be within spec. I still won't be reusing it. And it didnt feel loose.
Yeah the engine was making a knock like a SOB. I should also mention that the bearing spun.
I didnt take a picture of that sadly... But both halves of the bearing were paper thin and fused together. Not to mention razer sharp. LOL.
Yeah the engine was making a knock like a SOB. I should also mention that the bearing spun.
I didnt take a picture of that sadly... But both halves of the bearing were paper thin and fused together. Not to mention razer sharp. LOL.
How long did the engine run after the bearings spun?
10-23-2006, 05:19 PM
#13
Rennlist Member
Thread Starter
It ran maybe 5-6 minutes?
Yeah the crank has already been fixed (It was also bent!! LOL)
And I have 3 pistons in the block... Ive been working on this rebuild since mid july. And it would be done right now if I had a replacement tolerance group 2 piston. Which I'm just going to try to buy from a dealer.
Yeah the crank has already been fixed (It was also bent!! LOL)
And I have 3 pistons in the block... Ive been working on this rebuild since mid july. And it would be done right now if I had a replacement tolerance group 2 piston. Which I'm just going to try to buy from a dealer.
10-23-2006, 05:20 PM
#14
Race Car
For the piston to go so far up, his rod and bearings must be completely gone. With that much metal in the engine, I would look for another engine since you can find a good running complete engine for $400 to $500.