Blown Engine Video

swooshdave · Feb 13, 2019

I don't think anyone has found this one in my other thread. But I know you guys want to see the carnage...

Lineslinger · Feb 13, 2019

Munched up.
My sympathies to the owner.

robs ss · Feb 13, 2019

So, what's the scenario here?
* Big end seizes
* Rod bends and breaks
* Cap bolts fail
* Loose junk + rotating crank ventilates case
Is that how you believe it happened?

Jerry Doe · Feb 14, 2019

Hi Dave,

Wow, what a mess. I noticed you have a MK3 timing cover. Did you have the oil wet sumping drain spring/ valve in that Mk3 timing cover? I wonder if that got stuck or something.

I am looking forward to the going back together movie.

Cheers

cjandme · Feb 14, 2019

Thanks for posting that, and yes I'm staying tuned

didn't I read that you're getting the barrels sleeved and the cases repaired. Exciting options for a rebuild await, right. CNW waisted bolts, JS light weight slugs etc... etc.... etc

850commando · Feb 14, 2019

how far does the crack propagate through the barrel. will you be able to save it and resleeve?

swooshdave · Feb 14, 2019

robs ss said:
So, what's the scenario here?
* Big end seizes
* Rod bends and breaks
* Cap bolts fail
* Loose junk + rotating crank ventilates case
Is that how you believe it happened?

Pretty sure the big end cap exited out the bottom at great speed.

swooshdave · Feb 14, 2019

850commando said:
how far does the crack propagate through the barrel. will you be able to save it and resleeve?

More info here including comments about the barrel.

https://www.accessnorton.com/NortonCommando/heart-transplant.25880/

I won’t try to save this one as I have others available although they need their own help.

swooshdave · Feb 14, 2019

Jerry Doe said:
Hi Dave,

Wow, what a mess. I noticed you have a MK3 timing cover. Did you have the oil wet sumping drain spring/ valve in that Mk3 timing cover? I wonder if that got stuck or something.

I am looking forward to the going back together movie.

Cheers

No, it was the oil pump seal that fell out when I was refitting the timing cover.

The MkIII cover never seemed to make much of a difference with wetsumping. Not sure why.

speirmoor · Feb 14, 2019

A sad scenario but weirdly entertaining and educational at the same time.

ntst8 · Feb 14, 2019

swooshdave said:
The MkIII cover never seemed to make much of a difference with wetsumping. Not sure why.

I have a Mk III cover on my bike as well and it doesn’t stop wet sumping either. The non return seems to be good at sticking open after not many uses.

swooshdave · Feb 14, 2019

ntst8 said:
I have a Mk III cover on my bike as well and it doesn’t stop wet sumping either. The non return seems to be good at sticking open after not many uses.

I'm thinking of going back the original cover at this point although the cam chain inspection port is nice.

swooshdave · Feb 14, 2019

speirmoor said:
A sad scenario but weirdly entertaining and educational at the same time.

You can't look away...

CanukNortonNut · Feb 14, 2019

swooshdave said:
No, it was the oil pump seal that fell out when I was refitting the timing cover.

The MkIII cover never seemed to make much of a difference with wetsumping. Not sure why.

That is a tough pill to chew on.

There is good value in an oil pressure gauge. I use mine
#1 to see that I got oil pressure when start up and #2 for trending. I also know when my bike is running hot. Watching your other thread I see you got Don's oil pressure gauge kit so it doesn't happen again. Good move. Maybe a thread to show how you wire that up to your bike is in order.

Cheers,
Thomas

swooshdave · Feb 14, 2019

CanukNortonNut said:
That is a tough pill to chew on. There is good value in an oil pressure gauge. I use mine
#1 to see that I got oil pressure when start up and #2 for trending. I also know when my bike is running hot. Watching your other thread I see you got Don's oil pressure gauge kit so it doesn't happen again. Good move. Maybe a thread to show how you wire that up to your bike is in order.
Cheers,
Thomas

I have a while before I get to that part.

Whiterabbit · Feb 14, 2019

I watched that vid, sad day for that engine. I do like the guys videos though!

swooshdave · Feb 14, 2019

Whiterabbit said:
I watched that vid, sad day for that engine. I do like the guys videos though!

That would be our own @Mike T here on the forum.

Luckily it's been three years of mourning so I'm now over it and ready to start the healing.

Madnorton · Feb 15, 2019

Mk3 anti drain valve will stay open when you stop. If you are leaving the bike for a period, switch off, select first nudge bike backwards, select neutral and put bike on stand - the valve will now be shut.

worntorn · Feb 15, 2019

3 years, oh no, how did that sneak by? I would have guessed this happened about 1 year ago. ( Checks his pulse to make sure he's still alive)

Glen

baz · Feb 15, 2019

swooshdave said:
No, it was the oil pump seal that fell out when I was refitting the timing cover.

The MkIII cover never seemed to make much of a difference with wetsumping. Not sure why.

No doubt you already know this but the seal that fell off ,
it was the correct MK3 seal? IE the flat seal and not the conical one that previous models had?