Topic: Shop stories!

[grcamna2]

BMW uses high pressure fuel systems on their modern turbocharged vehicle engines. The high pressure fuel injector are piezo type, and problematic at best.
The diagnostic software is getting better, but was an absolute joke for many, many years.

BMW of NA requires proof, and diagnostic codes for replacing parts in the high pressure system. So while the software decides to drag its feet and reboot several times, the poor car(7-series, V8 twin turbo) is sitting there chugging away black smoke from excessive fuel.

Then the engine goes dead, "oh well, probably stalled". See a massive puddle of oil forming under the engine area.
My reaction: 

The faulted cylinder flooded so badly that it hydrolocked and sent the piston out the path of least resistance....the aluminum cylinder block!

My brother is a 'big problem' tech for Cummins... he likes to use the phrase, "Rapid disassembly without the aid of hand tools."

lol    ouch

[Davidov]

BMW uses high pressure fuel systems on their modern turbocharged vehicle engines. The high pressure fuel injector are piezo type, and problematic at best.
The diagnostic software is getting better, but was an absolute joke for many, many years.

BMW of NA requires proof, and diagnostic codes for replacing parts in the high pressure system. So while the software decides to drag its feet and reboot several times, the poor car(7-series, V8 twin turbo) is sitting there chugging away black smoke from excessive fuel.

Then the engine goes dead, "oh well, probably stalled". See a massive puddle of oil forming under the engine area.
My reaction: 

The faulted cylinder flooded so badly that it hydrolocked and sent the piston out the path of least resistance....the aluminum cylinder block!

My brother is a 'big problem' tech for Cummins... he likes to use the phrase, "Rapid disassembly without the aid of hand tools."

I've heard tales of those Cummins diesels still running after the crankcase has been "windowed". 

[dave500]

ive seen an 871 running with a hole in the case,guy comes charging over shouting shut it down shut it down theres oil pouring out underneath,it was an old Atkinson truck with an rc drill rig mounted on it.

[trueblue]

ive seen an 871 running with a hole in the case,guy comes charging over shouting shut it down shut it down theres oil pouring out underneath,it was an old Atkinson truck with an rc drill rig mounted on it.

What's scarier is when the blower seals start to leak on those 71 series engines, and they start to run on the oil that leaks into the engine.  We had one come in a few years back that did just that.  It was in an old Kenny, and it ran away when it was fully loaded.  First hint there was any trouble was when he was going down the highway and without any trouble it was doing over 130kph fully loaded, it would normally only do 95.  He pulled the strangler and that only slowed it down to about 80, he managed to pull it up and stall it out before it blew itself to pieces.  Mind you he cooked his brakes in the process.  Could have turned out much worse though, some new brake linings and blower seals and he was on his way again. 

[grcamna2]

ive seen an 871 running with a hole in the case,guy comes charging over shouting shut it down shut it down theres oil pouring out underneath,it was an old Atkinson truck with an rc drill rig mounted on it.

What's scarier is when the blower seals start to leak on those 71 series engines, and they start to run on the oil that leaks into the engine.  We had one come in a few years back that did just that.  It was in an old Kenny, and it ran away when it was fully loaded.  First hint there was any trouble was when he was going down the highway and without any trouble it was doing over 130kph fully loaded, it would normally only do 95.  He pulled the strangler and that only slowed it down to about 80, he managed to pull it up and stall it out before it blew itself to pieces.  Mind you he cooked his brakes in the process.  Could have turned out much worse though, some new brake linings and blower seals and he was on his way again. 

Would it have blown up?

[iron_worker]

There are lots of vids on YouTube of run-away diesels. It can be pretty scary and yes they can eventually let go since they can rev up way higher than designed. 

IW

[DH]

There are lots of vids on YouTube of run-away diesels. It can be pretty scary and yes they can eventually let go since they can rev up way higher than designed. 

IW

I have watched those. They will scare you just watching on youtube. I'd be too terrified to even get close enough to throw something into the intake to stop one.

[HondaMan]

There are lots of vids on YouTube of run-away diesels. It can be pretty scary and yes they can eventually let go since they can rev up way higher than designed. 

IW

I have watched those. They will scare you just watching on youtube. I'd be too terrified to even get close enough to throw something into the intake to stop one.

I once was participant in a patent when we created a way to stop the big diesels we used in the frac industry. These were V16 engines of 2400 BHP with 4 turbos feeding 2 hyperbar fuel rails to the banks. When we frac'd with hydrocarbons like methanol or alcohol (not done anymore, too expensive!) the stuff could get aerated at the blender truck under certain circumstances, and you could smell it in the air a little. But, the diesels would run on that little bit of scent, even when we E-stopped them and cut off their fuel! So, we created a Halon-dump system that injected into the fuel rails on Emergency Stop. and later had to taper it in a little slower: the first time we tried it, the techs went from near-redline (2200 RPM) to E-stop, and it stopped so suddenly it twisted the crankshaft in two! That was an expensive test.

[scottly]

I once saw a two-stroke CZ go into Diesel mode: my buddy crashed his bike, falling hard on the right side, which jammed the throttle WFO. He picked himself up and ran to the bike, frantically pressing the kill button to no avail while the motor screamed in agony. In desperation, he managed to yank the wire off the spark plug, which only ignited the fuel leaking from the tank and carb vents. Now the bike was not only still screaming it's guts out, it's on fire! I yelled to Sam to put the choke on, which finally shut it down. We got the fire out with minimal damage, but the excessive RPMs for so long severely wounded the motor. To it's credit, it didn't suffer a "rapid disassembly".  

[grcamna2]

Those vintage CZ's were Very durable.

[Bailgang]

My neighbor had his push mower with a 4hp briggs go diesel once, it didn't run away but it wouldn't shut off. I pulled the plug wire and much to my surprise the sucker stayed running, not quite as good as it did with the plug wire on but it still responded to throttle position and wouldn't shut off so I just pushed it into some tall grass and that killed it. It turned out it had a mouse nest under it's engine covers which made the engine overheat just the right amount to get the spark plug to act like a glow plug. I wish I had taken a vid of it because I never seen a gas briggs engine do that before.

[trueblue]

My neighbor had his push mower with a 4hp briggs go diesel once, it didn't run away but it wouldn't shut off. I pulled the plug wire and much to my surprise the sucker stayed running, not quite as good as it did with the plug wire on but it still responded to throttle position and wouldn't shut off so I just pushed it into some tall grass and that killed it. It turned out it had a mouse nest under it's engine covers which made the engine overheat just the right amount to get the spark plug to act like a glow plug. I wish I had taken a vid of it because I never seen a gas briggs engine do that before.

That's actually more common than you think with the briggs and scrap iron, because they are low compression it doesn't take much excess heat to keep them going.

[70CB750]

Those vintage CZ's were Very durable.

And single cylinders could be started forwards or backwards 

Here are CZs hanging at Barber museum.

[grcamna2]

Those vintage CZ's were Very durable.

And single cylinders could be started forwards or backwards 

Here are CZs hanging at Barber museum.

Backwards  ! you mean opposite of normal rotation ? Be fun to try to drive that

[70CB750]

Quite few stories reported by showoffs how it happened in front of some girl(s).       Instead of riding to thesun set, you back up into bushes, railing or parked car.

It matters not for 2 stroke which way it runs.

[MoMo]

Those vintage CZ's were Very durable.

And single cylinders could be started forwards or backwards 

Here are CZs hanging at Barber museum.

my 250 enduro should have been up there!

[Don R]

My mom had a 65 Buick that dieseled so bad you could drive it with the key off.  321 or something like that motor. She drove it around the town square once with the key off. She had one in later years that would hot start flood it's self. The choke would reset even if the engine was warm. We drilled the choke plate on that one.

[750cafe]

My mom had a 65 Buick that dieseled so bad you could drive it with the key off.  321 or something like that motor. She drove it around the town square once with the key off. She had one in later years that would hot start flood it's self. The choke would reset even if the engine was warm. We drilled the choke plate on that one.

I happen to have one of those. It has a 300 CID V-8. The air filter cover on those engines denoted the torque of the engine.
As this one is a 2-BBL. it says 320 on the cleaner lid denoting max engine torque output.  (The 4-BBL versions stated 340)




Eric

[HondaMan]

Quite few stories reported by showoffs how it happened in front of some girl(s).       Instead of riding to the sun set, you back up into bushes, railing or parked car.

It matters not for 2 stroke which way it runs.

Out shop lead tech had a Hodaka habit, back in their day. He finger-ported his Wombat, then milled the head and lapped in the face so it was about 12:1 compression, and added the [in]famous nitro-oil mix Blendzall to his gas tank. We went to the races with him: he started it up on the line and when the flag dropped and he dropped the clutch, the bike shot backward under him, flipped him over by the ankles, and ran back through the whole pack before it finally fell over! It didn't sound any different from when it ran forward...

[70CB750]

Velorex (as Velorex sidecar, same company)  was building these  from 50ties to 70ties, powered by Jawa built 2 stroke 175 later 350 ccm.  It had a starter but you could push it to start either forward or backwards.

[strynboen]

my old puch ms 50..did also run both vays..specily if the bosch ignision vas set low..

[joeyvans]

I'm about to start some work on a '66 Yamaha YA-6... and don't think I'm not going to try this after I get it rolling.

[trigger]

Went to see a mate that owns a BMW dealership. He told me about a woman that bought a new 3 series automatic and asked for it to be delivered to her home. Three weeks later she came in to the dealership complaining that the car would not drive at night time. She explained that in the day time if she put it into D, it would drive OK but, at night when she put it into N, it would not move

[Don R]

My mom had a 65 Buick that dieseled so bad you could drive it with the key off.  321 or something like that motor. She drove it around the town square once with the key off. She had one in later years that would hot start flood it's self. The choke would reset even if the engine was warm. We drilled the choke plate on that one.

I happen to have one of those. It has a 300 CID V-8. The air filter cover on those engines denoted the torque of the engine.
As this one is a 2-BBL. it says 320 on the cleaner lid denoting max engine torque output.  (The 4-BBL versions stated 340)




Eric

Nice car, I hope yours ran better than ours did. I remember the 340 in the air cleaner. I had a 64 wildcat with the 425, it would run side by side with a tri power 4 speed GTO. that red coloc always fades until it's pink. WoW.

[faux fiddy]

Those vintage CZ's were Very durable.

And single cylinders could be started forwards or backwards 

Here are CZs hanging at Barber museum.

The mannequin cop and his dog are just down there to the left...