BJ74 won't turn off

LowFour · 10-23-06, 04:32 AM

I posted about this problem a while ago (http://forum.ih8mud.com/showthread.php?t=57856), the consensus then was a dodgy VSV. I haven't done anything about it, but rang a couple of mechanics when I was in Darwin last week. They sounded pretty clueless, it sounded like the job was going to be an expensive fishing trip.

Since then I've done a bit of looking around on the net, found out that if the brakes or clutch are also dodgy (mine are, especially clutch), there might be problems with the vacuum system. One guy wrote that his clutch booster seal had failed, and with each clutch application he was pumping fluid into the vacuum system, which affected the brakes and the vacuum shut off.

Anyone got any ideas about this? It's a twenty year old truck, so it's no great surprise if these sort of seals start to go. I took it to a brake and clutch place in Darwin, who said the clutch master cylinder needed resleeving - no replacement available in Oz. But maybe the problem is more with the booster circuit, as the clutch (and the shut-off) work fine on short trips, it's only when the engine's been running for a half hour or so, in build-up weather, that things start going weird.

Peter

Satamax · 10-23-06, 07:13 AM

That's weird! No replacement in aussie???

The guy is yalking shit, any clutch master cylinder, from a HJ60/61/BJ7* from that period with clutch booster should work. There's several things which can go wrong in the vacuum circuit. The pump at the end of the alternator is often one. As for shuting off the part 22419 is a lever which gonna stop the engine. If it's not this one, there should be one looking right this one, on the injection pump, which should stop the engine.

LowFour · 10-23-06, 07:51 AM

I found that lever after a few heavy-duty stalls. It's annoying though if you've got a few errands around town, after the engine's warm, and you have to pull the bonnet to stop it every time. The clutch is probably more of a nuisance though, my left leg is getting twice the size of the right. Because the non-stop and the hard clutch happen at the same time, that has got me thinking about all this vacuum bizness.

lshobie · 10-23-06, 07:56 AM

If the clutch is hard then your clutch booster is shot. It is a tiny booster inside the truck on the firewall. Order up the parts or buy a new one and you should be fixed up.

crushers · 10-23-06, 08:06 AM

before i ordered the booster i would check the amount of vacumm coming out of the pump and follow all the vacumm lines to make sure none are cracked or came loose...

zaxxon · 10-23-06, 11:33 AM

I have the same problem with shutting down and clutch stiffness. I figure it is a vacum leak. Giving the throtle a shot is enough for mine to shut down. It dose not happen often enough for me to find the leak yet.

oldblue · 10-23-06, 04:58 PM

Remove the hoses from the brake and the cluch boosters, plug them off with a bolt, start the motor and if everthing else works, then its in the boosters, fit one hose back on then retry it.
Process of trying each part till you find the leak.
A friend had this problem, turned out to be the clutch booster seal.

Stone · 10-23-06, 05:58 PM

The VSV is in a bad position on the 13B-T...it's prone to getting wet when doing deep water fording or washing your engine. Sheldon and Greg pointed this out to me, and I found out for myself when my BJ74 wouldn't shut off one day after being washed. You get that VSV wet often enough and it will eventually kick the bucket.

Buy yourself some vacuum hoses to extend the ones on the VSV and relocate it to a moe logical spot.

widewestcruiser · 10-23-06, 07:28 PM

Both my BJ 74s had that problem and it was the clutch booster seal,I took it apart and used vasaline around the rubber seals,like Zach says just give it more throtle and it will shut off.

Radd Cruisers · 10-23-06, 07:36 PM

Same on a local truck, clutch booster.

How about putting a vacume line inside the truck from the VSV and whenyou want to shut it down, pop it in your mouth and suck air like the devil......

LOLOL

Gotta have some fun around here once and awhile...

brownbear · 10-29-06, 08:01 PM

Just buy a vacuum gauge and tee it in. See what it pulls. You probably have a leak in the system. Look for obvious stuff on the lines first. Like a crack or a loose end.

Trace the lines from the Alt. If your vacuum is weak, your engine won't shut down, brakes will be hard, clutch heavy. Possible 4x4 won't engage if you have vacuum in that..........

My Mercedes diesel is covered in vacuum lines. Vacuum door locks,etc... the whole thing uses vacuum. Even the heating system in depth...

LowFour · 04-02-07, 10:40 PM

Problem seems to be sorted - see http://forum.ih8mud.com/showthread.p...61#post2022261

Peter

10-23-06, 04:32 AM	#1
LowFour IH8MUD Rookie Join Date: Jun 2005 Location: Borroloola, Australia Posts: 58	BJ74 won't turn off I posted about this problem a while ago (http://forum.ih8mud.com/showthread.php?t=57856), the consensus then was a dodgy VSV. I haven't done anything about it, but rang a couple of mechanics when I was in Darwin last week. They sounded pretty clueless, it sounded like the job was going to be an expensive fishing trip. Since then I've done a bit of looking around on the net, found out that if the brakes or clutch are also dodgy (mine are, especially clutch), there might be problems with the vacuum system. One guy wrote that his clutch booster seal had failed, and with each clutch application he was pumping fluid into the vacuum system, which affected the brakes and the vacuum shut off. Anyone got any ideas about this? It's a twenty year old truck, so it's no great surprise if these sort of seals start to go. I took it to a brake and clutch place in Darwin, who said the clutch master cylinder needed resleeving - no replacement available in Oz. But maybe the problem is more with the booster circuit, as the clutch (and the shut-off) work fine on short trips, it's only when the engine's been running for a half hour or so, in build-up weather, that things start going weird. Peter __________________ 1984 Hilux LN65R-MRPQ - now a bush taxi for an extended Aboriginal family 1986 BJ74RV-MRXQ with 250k on the clock

10-23-06, 07:51 AM	#3
LowFour IH8MUD Rookie Join Date: Jun 2005 Location: Borroloola, Australia Posts: 58	I found that lever after a few heavy-duty stalls. It's annoying though if you've got a few errands around town, after the engine's warm, and you have to pull the bonnet to stop it every time. The clutch is probably more of a nuisance though, my left leg is getting twice the size of the right. Because the non-stop and the hard clutch happen at the same time, that has got me thinking about all this vacuum bizness. __________________ 1984 Hilux LN65R-MRPQ - now a bush taxi for an extended Aboriginal family 1986 BJ74RV-MRXQ with 250k on the clock

10-23-06, 07:56 AM	#4
lshobie IH8MUD Lifer Join Date: Feb 2004 Posts: 1,859	If the clutch is hard then your clutch booster is shot. It is a tiny booster inside the truck on the firewall. Order up the parts or buy a new one and you should be fixed up. __________________ Louis Check out my youtube videos at: www.youtube.com/lshobie Join the True North Toyota Land Cruiser Club in Ottawa http://landcruisers.ca/

10-23-06, 08:06 AM	#5
crushers IH8MUD Lifer Join Date: Feb 2004 Posts: 9,828	before i ordered the booster i would check the amount of vacumm coming out of the pump and follow all the vacumm lines to make sure none are cracked or came loose... __________________ pulling this info out of my ass so take it with a pound of salt "People are poor because they don't spend money wisely, tough sh!t !!! " John Galt 09/22/08 "educate yourself. Sorry if that seems too blunt." John Galt 11-01-08 Wayne in Ontario http://www.ivoac.ca join today

10-23-06, 11:33 AM	#6
zaxxon IH8MUD Junior Join Date: Mar 2006 Location: edm Posts: 98	hit the gas to turn off I have the same problem with shutting down and clutch stiffness. I figure it is a vacum leak. Giving the throtle a shot is enough for mine to shut down. It dose not happen often enough for me to find the leak yet. __________________ 1987 BJ74

10-23-06, 07:13 AM	#2
Satamax IH8MUD Regular Join Date: Oct 2004 Location: South western alps south east part of France. Posts: 286	That's weird! No replacement in aussie??? The guy is yalking shit, any clutch master cylinder, from a HJ60/61/BJ7* from that period with clutch booster should work. There's several things which can go wrong in the vacuum circuit. The pump at the end of the alternator is often one. As for shuting off the part 22419 is a lever which gonna stop the engine. If it's not this one, there should be one looking right this one, on the injection pump, which should stop the engine.

10-23-06, 04:58 PM	#7
oldblue IH8MUD Junior Join Date: Oct 2006 Location: Nelson,New Zealand. Posts: 154	Remove the hoses from the brake and the cluch boosters, plug them off with a bolt, start the motor and if everthing else works, then its in the boosters, fit one hose back on then retry it. Process of trying each part till you find the leak. A friend had this problem, turned out to be the clutch booster seal. __________________ Prado, Electric to Manual Hub conversions.[ Your Own Hubs ] oldblue@clear.net.nz

10-23-06, 05:58 PM	#8
Stone IH8MUD Lifer Join Date: May 2004 Location: BC, Canada TLCA# 13772 Posts: 1,992	The VSV is in a bad position on the 13B-T...it's prone to getting wet when doing deep water fording or washing your engine. Sheldon and Greg pointed this out to me, and I found out for myself when my BJ74 wouldn't shut off one day after being washed. You get that VSV wet often enough and it will eventually kick the bucket. Buy yourself some vacuum hoses to extend the ones on the VSV and relocate it to a moe logical spot. __________________ Stone's Land Cruiser & Flyfishing Pics Flyfishing British Columbia: www.flyfishbc.com bcfishingreports.com

10-23-06, 07:28 PM	#9
widewestcruiser IH8MUD Junior Join Date: Jun 2005 Location: Summerland,BC Posts: 132	Both my BJ 74s had that problem and it was the clutch booster seal,I took it apart and used vasaline around the rubber seals,like Zach says just give it more throtle and it will shut off.

10-23-06, 07:36 PM	#10
Radd Cruisers IH8MUD Lifer Join Date: Sep 2002 Location: Vancouver Island BC Canada Posts: 3,831	Same on a local truck, clutch booster. How about putting a vacume line inside the truck from the VSV and whenyou want to shut it down, pop it in your mouth and suck air like the devil...... LOLOL Gotta have some fun around here once and awhile... __________________ Come and visit us in Duncan, BC www.raddcruisers.ca --> 60 Series Cable Lockers available - 4.11s or 3.70s - handles and cables included --> 12HT & H55F combos available - complete & running --> in stock and ready to go.

10-29-06, 08:01 PM	#11
brownbear Mod in Hibernation Join Date: Sep 2004 Location: Where diesels purr and turbos whine TLCA# 15584 Posts: 6,184	Just buy a vacuum gauge and tee it in. See what it pulls. You probably have a leak in the system. Look for obvious stuff on the lines first. Like a crack or a loose end. Trace the lines from the Alt. If your vacuum is weak, your engine won't shut down, brakes will be hard, clutch heavy. Possible 4x4 won't engage if you have vacuum in that.......... My Mercedes diesel is covered in vacuum lines. Vacuum door locks,etc... the whole thing uses vacuum. Even the heating system in depth... __________________ -84 BJ60, Finally on the FN road! -91 FJ80, wife's ride Iron Butt award winner of the Cruise Moab 08 !

04-02-07, 10:40 PM	#12
LowFour IH8MUD Rookie Join Date: Jun 2005 Location: Borroloola, Australia Posts: 58	Problem seems to be sorted - see http://forum.ih8mud.com/showthread.p...61#post2022261 Peter __________________ 1984 Hilux LN65R-MRPQ - now a bush taxi for an extended Aboriginal family 1986 BJ74RV-MRXQ with 250k on the clock

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