Tune up


IHC in the early to mid-fifties.

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Golden Jubilee
Golden Jubilee

Posts: 434

Joined: Mon Sep 07, 2015 11:14 am

Post Fri Jun 28, 2019 11:07 am

Tune up

Do you tune your own? Valves , carb, VA , Dwell
What oil type , settings , just curious what others have done with their stock motors. No insults
if you don't like them stock thats good as for me I like em all but
I like dickering around with my stock engine and era tools of the trade just me ?

Image

Whats in your tool box ?
Image

☞ Fellow IH motor heads,
This SD240 engine is totally restored and mechanically correct.
☑New carburetor , vacuum advance generator and starter.
☑Valves, dwell , timing and VA are spot on:
☑Dwell 31 @ 750rpm
☑Valves @ .025 hot
☑Timed @ 7deg btdc
☑Manifold vac pressure16c 125' elevation at idle
☑6volt system all new stock including wiring
☑Motor oil Standard Shell Rotella.
☞ Thanks for looking and listening , be safe - sm
Last edited by Harvey on Tue Jul 02, 2019 9:05 pm, edited 1 time in total.
$ 75.00 or Best offer , No rush to sell.
Thanks for Looking , - SM

Golden Jubilee
Golden Jubilee

Posts: 554

Joined: Wed Sep 05, 2018 1:50 pm

Location: Northern New Mexico

Post Fri Jun 28, 2019 1:42 pm

Re: Tune up

That's a big part of the fun for me with this hobby. These engines are so nice to work on compared to the modern stuff that's out there. Everything is accessible, the carb alone is a joy, I can have mine off the truck in less than 5 minutes.


Question? Is your truck 12 volts or does your tach and dwell meter work with a 6 volt system?
56 S120 4x4,
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Golden Jubilee
Golden Jubilee

Posts: 434

Joined: Mon Sep 07, 2015 11:14 am

Post Fri Jun 28, 2019 4:01 pm

Re: Tune up

[quote]Question? Is your truck 12 volts or does your tach and dwell meter work with a 6 volt system?/quote]

Glad you asked , as I was going to post the information for my 12volt timing light.

The dwell & tac meter works on 6volt.
Now you did not ask but:
The timing gun is 12volts and can be used on a 6volt system as the strobe light works off the engines HV plug wires
but dose take an external 12volt battery hookup.
I was instructed some time ago to connect the 12volt leads on the gun input directly to a remote 12volt battery and then
with a separate wire connect the negative terminal of the 12volt battery to the trucks frame.
I have a brass terminal right on the front bumper for this connection.
Works great.
I use to know the reasoning for the negative frame hookup but it escapes me right now. There is much information and mis information on the
web in regard to a 12v timing light used on a 6 volt system , I go with what I was taught before computers..
$ 75.00 or Best offer , No rush to sell.
Thanks for Looking , - SM

Golden Jubilee
Golden Jubilee

Posts: 7561

Joined: Thu Dec 27, 2012 12:45 pm

Location: Canada's left Coast

Post Fri Jun 28, 2019 4:08 pm

Re: Tune up

I like my modern vehicles. They don't need any attention other than regular maintenance. I build my old IHC with updated running gear so the required "work " will be less.
An old a analog meter, like the one in the picture should not be external voltage dependent.
Since you do your own work, maybe you could explain how a carburetor works? Someone on this forum may be wondering.
I would rather have tools I do not need than to need tools I do not have
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Golden Jubilee
Golden Jubilee

Posts: 434

Joined: Mon Sep 07, 2015 11:14 am

Post Fri Jun 28, 2019 4:19 pm

Re: Tune up

As I said the RPM meter works on 6volt as its a combo volt meter as well no brainer there right?
I would pose your question to the the carb guy on this form
elementary as it is you or another member would be better
served by an expert and since we have a resident carb guy
he may chime in for you. and others..
I can set the idle and adjust air flow for the va with ease & correctly
using the Vacuum gage and RPM meter. A seasoned mechanic also uses
his ear , that of course comes with experience.
Even a seasoned shade tree mechanic like me can get a feel for the
sweet spot and how sweet it is :)

take care-sm

maybe Mike can help you with your carb question
$ 75.00 or Best offer , No rush to sell.
Thanks for Looking , - SM

Golden Jubilee
Golden Jubilee

Posts: 7561

Joined: Thu Dec 27, 2012 12:45 pm

Location: Canada's left Coast

Post Fri Jun 28, 2019 4:53 pm

Re: Tune up

There are two vacuum sources. Which one do you use?.
I would rather have tools I do not need than to need tools I do not have
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Golden Jubilee
Golden Jubilee

Posts: 434

Joined: Mon Sep 07, 2015 11:14 am

Post Fri Jun 28, 2019 5:09 pm

Re: Tune up

Right there are two..

Let someone else be the irritant for a change will ya, just kidding :).
looking forward to seeing those leathers your making.
Were not talking chafes folks - lol
Last edited by Harvey on Fri Jun 28, 2019 9:09 pm, edited 5 times in total.
$ 75.00 or Best offer , No rush to sell.
Thanks for Looking , - SM

Golden Jubilee
Golden Jubilee

Posts: 554

Joined: Wed Sep 05, 2018 1:50 pm

Location: Northern New Mexico

Post Fri Jun 28, 2019 5:17 pm

Re: Tune up

Altitude plays a big part when it comes to reading manifold vacuum, you get a considerable drop for every thousand feet above sea level. I live at 7,700 feet in elevation and pull about 19 psi on my motor, not bad considering how high up I am. I also have lean the carb out a little bit and slightly retard the ignition for those conditions.
56 S120 4x4,
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Golden Jubilee
Golden Jubilee

Posts: 434

Joined: Mon Sep 07, 2015 11:14 am

Post Sat Jun 29, 2019 1:31 pm

Re: Tune up

A couple obervations and tips.

For those who choose like me, to keep it 6volt , start with proper size conductors and solid electrical terminals and connections right at the starter. You won't be disappointed . Rate the wire at least 1/0 with copper lugs. I prefer bolted type but crimps are fine when done properly.

And don't overlook a good ground from the battery directly to the generator , there is a reason the Generator has a 1/4"Threaded Screw Hole on the frame. Mine even had a ground symbol on it..

Also there is an overlooked item on the firewire near where the steering shaft passes through, you will find a Factory Marked Grounding Point NOT to be confused with the other small one at the firewall with wire that is near the top of the engine on the left side. Usually factory connected to the engine head.
The one I speak of will provide a better cab ground for dash lights and gauges.
(I find it rather strange that this symboled factory cab ground was not used, could it be only on the R112 cabs ?? Doubtful but, I hope some one checks theirs for this and chimes in)

This is all for the novice if a pro wants to chime in please do. but refrain if you have nothing constructive to add. It just muddies up a good start to a conversation.
Spelling and grammar to be excused.

I like dickering around with my stock engine and era tools of the trade just me ?
$ 75.00 or Best offer , No rush to sell.
Thanks for Looking , - SM

Golden Jubilee
Golden Jubilee

Posts: 554

Joined: Wed Sep 05, 2018 1:50 pm

Location: Northern New Mexico

Post Sun Jun 30, 2019 4:56 pm

Re: Tune up

So what is your dwell setting and at what rpm?
56 S120 4x4,
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