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Old 09-11-2018, 04:38 PM   #1
Cwazywazy
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Default Diesel refuses to diesel

Not gonna bother trying D24t.com cause that place is dead.

Ran perfectly fine. Felt like it still had all 80 angry ponies. Then the next morning it wouldn't start. (Thursday.) I absolutely cannot figure it out. Even starting fluid (I know...) didn't make it run. Has about a half tank, the front 3 injectors will spurt diesel if I crank with the lines cracked, the back 3 just kinda ooze diesel a little. Did a seal blow out in the pump, maybe?
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Old 09-11-2018, 04:44 PM   #2
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Have you had the valve cover off to check valves are working? Or a compression test?

These things are pretty basic fuel, air, and timing. So one of those is bad/missing. You have fuel. How is the air supply? Then after that is the engine timing with the timing belt but also you have to check that mechanical injection pump is timed correctly. It will pump fuel as long as it turns but if it jumped time it won't run.
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Old 09-11-2018, 05:21 PM   #3
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I think the non-turbo engines were rated at 83 hp. I'm not sure that mine ever got there.

Extremely well well maintained engine. Three thousand mile Diesel spec oil changes as a religion. Injectors and injector pump professionally rebuilt at 110k miles. Head rebuilt at 140k miles.

At 180,082 miles mine, one day, just refused to start. Cam and injector timing good. Fuel to injectors. All Glow plugs worked. Only thing I couldn't check, for lack of tools, was compression.

Just worn out. Not enough compression to go pop.

Al Gore had not invented the WWW by that time but later I discovered that my 180k was just about the expected life of these engines.

Reused body for engine upgrade.
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Old 09-11-2018, 06:03 PM   #4
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Do that^^^.

VW made a lot of money from Volvo with those engines but Volvo didn't get the good end of the deal imo. Never cared for these when you could buy an old mercedes for the same price or not much more. For the Volvo it is Gimme dat redblock please or put something else there.
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Old 09-11-2018, 06:28 PM   #5
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This car only has about 152k on the clock, I'm really hoping it's not the compression..

Is this little nub on the pump belt a timing mark?

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Old 09-12-2018, 02:33 PM   #6
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This car only has about 152k on the clock, I'm really hoping it's not the compression..
Not likely the compression would have drastically dropped in multiple cylinders from one day to the next, but a glow plug can, and these engines are notoriously hard to start with one (or more) failed GPs. Test them individually-- just verifying they are receiving +12VDC isn't telling you enough, although if the GP relay is malmunctioning that is obviously a problem.

My money's on either GP issues OR air intrusion into the fuel supply. You did say that 3 injector lines were not spitting? Troubleshooting step: Install a section of clear fuel line at the injector pump out (return) line and watch for air bubbles.

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Is this little nub on the pump belt a timing mark?
Not the belt, but the cog? It should line up with the corresponding indentation line on the IP when at TDC. Are you suspecting the timing jumped?
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Old 09-12-2018, 02:58 PM   #7
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Not likely the compression would have drastically dropped in multiple cylinders from one day to the next, but a glow plug can, and these engines are notoriously hard to start with one (or more) failed GPs. Test them individually-- just verifying they are receiving +12VDC isn't telling you enough, although if the GP relay is malmunctioning that is obviously a problem.

My money's on either GP issues OR air intrusion into the fuel supply. You did say that 3 injector lines were not spitting? Troubleshooting step: Install a section of clear fuel line at the injector pump out (return) line and watch for air bubbles.

Not the belt, but the cog? It should line up with the corresponding indentation line on the IP when at TDC. Are you suspecting the timing jumped?
I replaced the first 5 GPs awhile ago, not like that would cause low compression anyway. I've started this engine in ~50 degree weather without glow plugs. According to the service history the head was rebuilt and belts replaced about 20-25k ago. (2006.)
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Old 09-13-2018, 12:51 AM   #8
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I replaced the first 5 GPs awhile ago, not like that would cause low compression anyway. )
GPs have nothing to do with compression. Which brand GP? Anything not Bosch Duraterm is suspect.

If you are sure all the GPs are good, then you must turn to verifying there is no air getting into the fuel supply. If you don't want to install a section of clear fuel line in the return path (to see if air bubbles are present) an alternative method is to splice in an electric fuel pump upstream of the fuel filter, which should force feed pure liquid fuel into the injection pump.

These engines are not that complicated but the important stuff is different than for gassers. To start they need: Fuel, compression, sufficient cranking speed, glow plugs.

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I've started this engine in ~50 degree weather without glow plugs.
That right there proves good compression by itself!
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Old 09-12-2018, 03:14 PM   #9
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Not likely the compression would have drastically dropped in multiple cylinders from one day to the next
Agreed.

What about the fuel shutoff solenoid? Are you sure it's working?
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Old 09-12-2018, 03:25 PM   #10
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Agreed.

What about the fuel shutoff solenoid? Are you sure it's working?
Yep.

I tried to start it on fluid, felt like one cylinder was firing and there was more smoke out the PCV hose than the exhaust.

This bitch is done.
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Old 09-13-2018, 02:02 PM   #11
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Yep.

I tried to start it on fluid, felt like one cylinder was firing and there was more smoke out the PCV hose than the exhaust.

This bitch is done.
Starting fluid + glow plugs = big BOOM. Think broken rings, pistons, etc.

Judging from the photo, the camshaft is about 30deg BTDC, so likely the crankshaft bolt was too loose and the TB pulley slipped there or the front camshaft pulley slipped. Interference engine so bent valves.
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Old 09-11-2018, 06:30 PM   #12
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Should I start looking for LSes or crank it some more?
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Old 09-11-2018, 06:47 PM   #13
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Crank it all you want. I did. Hooked up a big battery charger/starter and probably wore out the starter.

Put it in storage for the later engine replacement.
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Old 09-11-2018, 07:11 PM   #14
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185psi cylinder 1...
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Old 09-11-2018, 07:17 PM   #15
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https://www.volvoclub.org.uk/faq/Eng...ompressionTest

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. . . 400 psi for cylinders 1-4 and 360 psi for cylinders 5 and 6. This matches the general consensus that cylinders 5 and 6 can become starved . . . .
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Old 09-11-2018, 07:20 PM   #16
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Quote:
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185psi cylinder 1...
Cold or hot?
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Old 09-11-2018, 07:36 PM   #17
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Cold or hot?
Cold. This is a no start thread.

I was taking out the second GP when I heard some noise and turned around to see two bears behind me, so I'm staying inside for a little while.
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Old 09-11-2018, 07:47 PM   #18
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My experience with a VW diesel was on a 1980 VW Dasher Diesel Wagon. 115k miles and if it was colder than 45 degrees F it would have to be pushed a few feet to get it started. After 6 weeks of push starts I ventilated the block.
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Old 09-11-2018, 07:51 PM   #19
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That's waaaay low. Strange that it would go from running to that low so quickly, though.

Did it suddenly get cold there?
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Old 09-11-2018, 08:03 PM   #20
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That's waaaay low. Strange that it would go from running to that low so quickly, though.

Did it suddenly get cold there?
Yeah, but it was still 90 degrees when it stopped starting. I tested cyl 2, about 175psi and close to 300 after squirting a bit of oil in there.
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Old 09-11-2018, 08:07 PM   #21
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Quote:
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That's waaaay low. Strange that it would go from running to that low so quickly, though.

Did it suddenly get cold there?
It did get much cooler recently, i'm in NE Massachusetts, not too far away

edit, whoops, should have refreshed before posting
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Old 09-11-2018, 08:40 PM   #22
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My Diesel started and drove to work. Never again did as much as a pop.
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Old 09-12-2018, 09:25 AM   #23
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Quote:
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That's waaaay low. Strange that it would go from running to that low so quickly, though.

Did it suddenly get cold there?
Sudden drop in temp, or snapped ring,
Maybe the compression was already low and finally just gave up the ghost.
Check your valves.

Or just redblock swap because it just plops right in there

Last edited by 240240; 09-12-2018 at 09:37 AM..
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Old 09-12-2018, 10:29 AM   #24
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Sudden drop in temp, or snapped ring,
Maybe the compression was already low and finally just gave up the ghost.
Check your valves.

Or just redblock swap because it just plops right in there
Do a VW Quantum/Audi 4000 5 cylinder turbo engine swap.
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Old 09-11-2018, 09:09 PM   #25
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I'm gonna try squirting oil in all the cylinders to see if I can't get it to fire one last time and go beat the piss out of it.
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