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175 - what is this?

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orange-is-power View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote orange-is-power Quote  Post ReplyReply Direct Link To This Post Topic: 175 - what is this?
    Posted: 11 Mar 2016 at 7:32pm
What exactly is this and what does it do? Has a line coming from top of fuel tank, one coming from up front off the air breather tube, and another line. I forget where it goes to. Just wondering. Thanks.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote allisbred Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2016 at 7:44pm
I believe this is for the air horn pre heater. Please add a few more pictures of the line route. Best regards, Kevin
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Scooterboy Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2016 at 8:16pm
That is a fuel manifold, part of the thermostart system.
One line fuel.
One line to heater.
One line fuel return to tank.

I never seen one in operation and I'm not saying I know much about them but I think the system ignites fuel from the heater to warm the inside of the air intake manifold.


Edited by Scooterboy - 11 Mar 2016 at 8:32pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DSeries4 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2016 at 8:45pm
Originally posted by Scooterboy Scooterboy wrote:

That is a fuel manifold, part of the thermostart system.
One line fuel.
One line to heater.
One line fuel return to tank.

I never seen one in operation and I'm not saying I know much about them but I think the system ignites fuel from the heater to warm the inside of the air intake manifold.


x2.  You are correct.
'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Post Options Post Options   Thanks (0) Thanks(0)   Quote orange-is-power Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2016 at 9:10pm
So it's just something to aid starting in cold weather? Does it work automatically or how/when does it get used? Every time you start the engine? It appears to be original equipment. Thanks for the replies.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DSeries4 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2016 at 9:17pm
It is original equipment.  It is activated when you turn the key to the "start" position and hold it for 30 seconds or a minute.  It's just another kind of manifold heater.
'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Scooterboy Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2016 at 9:22pm
I know a wire goes from the heater to the ignition switch so one would think there is a position on your ignition switch to turn the heater on when needed. Probably once the ignition switch is moved to a different function the heater would be off.

Clean the area around the heater on the intake and see if the instruction plate is there.


Edited by Scooterboy - 11 Mar 2016 at 9:33pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BrianC Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2016 at 9:51pm
Yes the Perkins Thermostart system. If the 170/175 ignition key works like the 160 I have, to start the engine you turn the key all the way clockwise, then push it in, that activates the starter, right?
Prior to pushing in, with the key turned fully clockwise, electric power is sent to the thermostart valve. After 30+ seconds it heats up hot enough to open a valve letting fuel dribble in, it catches on fire.
Then you push it in to crank the engine.
So the fires heat in the intake manifold helps start cold start. Is it better than glowplugs or high wattage intake manifold grids? Perkins have a reputation for good cold starts. I think some Fords use the system, and most of the Perkins MF tractors.
Try it out, hold it clockwise 30-60 seconds, then see if that valve is warm. I don't know what could go wrong, but stuck valve, gelled fuel crud in that supply line. The valves are available.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Eldon (WA) Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2016 at 11:09pm
I've got 8 of these tractors and haven't found one that worked yet....
ALLIS EXPRESS!
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