things that might make you go WOW!!!!! thread

V8Druid

V8Druid

do it as well as you can,but learn to do it better
Bri963

Bri963

Well-known member
Left hooker said:
One for druid

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And me. I think they’re used for crucible repair in foundries.
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
wanna sell a few slates to pay the wages for this mob :oops:
1741457670844.png


and that's before you get them down off the scaff, stacked and transported away
1741457775284.png

how many times do you reckon they were handled ? :rolleyes::oops:
 
Gecko

Gecko

Well-known member
Not carbon - the piston metal has 'flowed' leaving that impression.
The marks that look like cracks ... are in fact cracks.
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
Gecko said:
Not carbon - the piston metal has 'flowed' leaving that impression.
The marks that look like cracks ... are in fact cracks.
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must've gotten incredibly hot to do that :oops::oops::oops: .. was it still running?? timing out??
so what head was on it to leave those marks, un-aligned with the current set up ???
 
Gecko

Gecko

Well-known member
What I know is fairly limited. The car belongs to a mates son who hasn't owned it for long.
Fluids and timing belt were replaced soon after purchace - everything measured fine.
Everything seemed ok ... until it didn't
Dropping the sump showed big-end #4 had slop measured in mm, but the timing was spot on.
Skipping ahead, the big-ends and mains are both 0.010" undersize and the pistons are 0.020" over.
So it looks like somone stuffed a rebuild, patched it and flogged it off hoping it'd be out of sight when it dropped it's bundle.

I think the deformation was brute force rather than heat. The engine was still running, but went from "normal" to "can't ignore" over 50km - on the freeway anfter a weekend away in the bush.

I've never been inside a 300tdi, but this valve looks ok to me. Confident it "wasn't there at the time"

1741859175548.png
 
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V8Druid

V8Druid

do it as well as you can,but learn to do it better
Gecko said:
What I know is fairly limited. The car belongs to a mates son who hasn't owned it for long.
Fluids and timing belt were replaced soon after purchace - everything measured fine.
Everything seemed ok ... until it didn't
Dropping the sump showed big-end #4 had slop measured in mm, but the timing was spot on.
Skipping ahead, the big-ends and mains are both 0.010" undersize and the pistons are 0.020" over.
So it looks like somone stuffed a rebuild, patched it and flogged it off hoping it'd be out of sight when it dropped it's bundle.

I think the deformation was brute force rather than heat. The engine was still running, but went from "normal" to "can't ignore" over 50km - on the freeway anfter a weekend away in the bush.

I've never been inside a 300tdi, but this valve looks ok to me. Confident it "wasn't there at the time"

View attachment 70242
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but that's recessed into the head/combustion chamber .. HTF could that come into contact with pistons unless timing was out and it was turned over (probably on the end of a tow rope in desperation when it wouldn't start) :(
 
Gecko

Gecko

Well-known member
My theory (I've never actually seen the car) is that the current valves and possibly the head) were not present when the sins were commited.
The exhaust valve has no circular marks to leave those witness marks, so the engine has been reworked since the damage was done.
As per most engines, the intake valves are larger than the exhausts - I've wondered if the engine was rebuilt using two sets of intake valves (which wouuld sit proud in the exhaust ports).

Clearly someone needs to be beaten with a camshaft over this.
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
Lancs Lad said:
Yep...
I'd see the grooves as bonus you've actually got more CC now 😂
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but lowered compression ratio (greater unswept volume - CR is swept volume, divided by unswept volume) ;)
 
Gecko

Gecko

Well-known member
Monkeybusiness said:
Snapped timing belt, then rebuilt with a new head?
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That's the first thought, but all four pistons show the same damage - is that notmal for a 300tdi?
V8Druid said:
but lowered compression ratio (greater unswept volume - CR is swept volume, divided by unswept volume) ;)
Click to expand...
I'm told there are four head gaskets available for the 300tdi to compensate for machining tolerances (and piston damage).
 
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