12H-T tach and won't...
- Thread starter skoki
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
I'm not sure about the 2H, but the 12H-T has a VSV that pulls a diapham to close a butterfly valve in the intake. The valve closes when you turn off the ignition, choking off the intake air. This is what stops the engine.
Do you have this valve installed? Is it plumbed? Is it wired? Is your vacuum pump connected?
The VSV should have power when the engine is running and no power when not (ignition off).
I forgot what your other question was so I'll post this reply and look at the thread again.
Do you have this valve installed? Is it plumbed? Is it wired? Is your vacuum pump connected?
The VSV should have power when the engine is running and no power when not (ignition off).
I forgot what your other question was so I'll post this reply and look at the thread again.
Oh, yeah.
I've never seen a 2H pick-up so I can't be sure about this one. I believe the pick-up mounting location is the same. Maybe you can confirm?
If so, try installing your 2H pick-up on the 12H-T bellhousing.
The wiring if the 12H-T pick-up is simple. One wire from the pick-up goes to the tach. The other goes to ground.
I've never seen a 2H pick-up so I can't be sure about this one. I believe the pick-up mounting location is the same. Maybe you can confirm?
If so, try installing your 2H pick-up on the 12H-T bellhousing.
The wiring if the 12H-T pick-up is simple. One wire from the pick-up goes to the tach. The other goes to ground.
ISPRO makes a tach that will work on a transplant diesel. It will fit into the 60 series cluster where the old tach is located. It requires gluing two sending units onto the flywheel. It looks factory when installed with a rubber gasket.
I've been tachless (oh maybe that's my problem?) for 3 years now.
Bob
I've been tachless (oh maybe that's my problem?) for 3 years now.
Bob
- Thread starter
- #7
There appear to be 2 VSV's. One on top of the engine which is already plumbed and one on the passenger side inner fender. I'm assuming it's the fender mounted VSV I need to plumb but what goes where? I've got 2 hoses coming from the engine. One comes from a white plastic valve on top of the engine, the other comes from down by the injection pump. I've also got 2 A/C hoses coming from the engine that are supposed to plumb into the idle up solenoid (where the heck is that?) and one vacuum hose coming from the firewall. So I've got 5 hoses in total and 2 ports on my VSV. Help!! Oh yeah my oil pressure gauge isn't working either. On the 2H there are 2 pickups on the right rear engine block, the 12H-T only has one. Is that an issue?
On the plus side my truck runs like a dream with the 12H-T in it! I actually passed a truck on the highway while in 5th gear!!
On the plus side my truck runs like a dream with the 12H-T in it! I actually passed a truck on the highway while in 5th gear!!
Ya, the feeling is nice eh?
The Hall Sensor sending unit at the bellhousing is pretty much the same for a whole host of applications (83180-60040)...including your Cdn spec H55F/2H and any 12HT/H55F from Japan...so if it worked before there is no reason it should not now that it is behind a 12HT...unless a wire got pinched in install, or a pin is bent...or...
As Sheldon mentioned, the two lines that were marked AC are for the AC idle up feature. If you don't have AC just plug. If you have not touched the lines of the VSV that bolts on the back of the crossover pipe on the engine (that is your shutdown VSV) they should be good, as it was shipped intact. Shoot Sheldon another note stating specifics to the (Info@address) if you are still not clear.
hth's
gb
- Thread starter
- #9
It is a pinched wire on my tach. So the fender mounted VSV is for the AC? I didn't touch the crossover mounted VSV but I'll double check the lines. So what are the other 2 lines for, the white valve on top of the engine and the line coming from below the the throttle connection? My brakes are a little soft too so maybe my I'm not getting enough vacuum?
The VSV behind the intake crossover controls shut down of the engine.
The VSV on the passenger side inner fender should be the AC Idle up.
Do you have AC on your HJ60?
The vacuum tube that heads to the firewall supplies the 2 vacuum soleniods for the vacuum shift 4x Tcase
If ANY of these small vacuum hoses are not conected to thier propper VSVs you will have a major vacuum leak and the engine will not be able to shut down.
Did you remove the 2H yourself?
- Thread starter
- #11
Hey Sheldon,
Yes I did pull the engine and I do have A/C. The fender mounted VSV was originally hooked up:
From firewall to a tee connection then to VSV
From tee connection at VSV to A/C
From VSV to dash pot near fuel intake
On the 12H-T there were 2 unhooked lines. The white plastic valve on top of the engine and anther line coming from beside the injection block. Where do these go?
Are vacuum leaks on a diesel as potentially harmful as they are on a gasser?
Thanks
Yes I did pull the engine and I do have A/C. The fender mounted VSV was originally hooked up:
From firewall to a tee connection then to VSV
From tee connection at VSV to A/C
From VSV to dash pot near fuel intake
On the 12H-T there were 2 unhooked lines. The white plastic valve on top of the engine and anther line coming from beside the injection block. Where do these go?
Are vacuum leaks on a diesel as potentially harmful as they are on a gasser?
Thanks
A picture is worth a thousand words...can you take some showing exactly what you mean, and post, or take and send to the info@ address.
If I am thinking correct, you mean the white plastic valve that bolts behind the intake crossover pipe, at the top on the intake manifold above the glow screen? For the second line...do you mean beside the injection pump?
When I get home tonight I'll sort through my photos and see what I have that might help...
Not for the same reason as a gasser, but it can be harmful to your health if you do not have brake boost assist, or harder to change gears if you have clutch boost assist, and of course your systems that run off vacum will be impacted (vacum swtiched 4wd, shutdown VSV, idle up VSV for AC), etc...
hth's
gb
Why didn't you say you bought your engine from G&S!? Those guys are great. Let them be your primary info resource. You can't go wrong.
