Timer Question

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Oldav8tor
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Timer Question

Post by Oldav8tor » Thu Jul 04, 2019 8:39 pm

I'm prepping my rebuilt engine to get it ready to install in my T. I went to put my New Day timer on and have a question. Since the engine came from the rebuilder without a timer, I don't know which way to put the brush on the camshaft. Since the hole for the retainer pin goes all the way thru it's possible to install the brush 180 degrees off. I'd just as soon get it right the first time :D

Is there a easy way to determine the correct position for the brush on the camshaft?
1917 Touring
1946 Aeronca Champ
1952 Willys M38a1 Jeep (sold 2023)
1953 Ford Jubilee Tractor

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Tony_H
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Re: Timer Question

Post by Tony_H » Thu Jul 04, 2019 9:14 pm

I imagine the simplest thing to do is set No 1 so it's just past TDC on firing stroke and see what position the brush contacts No 1 on the commutator.
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Oldav8tor
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Re: Timer Question

Post by Oldav8tor » Thu Jul 04, 2019 9:51 pm

Soooo..... to find TDC on the firing stroke I need to determine when both valves are closed?
1917 Touring
1946 Aeronca Champ
1952 Willys M38a1 Jeep (sold 2023)
1953 Ford Jubilee Tractor


Dallas Landers
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Re: Timer Question

Post by Dallas Landers » Thu Jul 04, 2019 9:54 pm

Pul #1 plug and put your finger over the hole. When you feel air rushing out #1 is on its way up to TDC. I use a piece of weed eater string to know when I on TDC


Norman Kling
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Re: Timer Question

Post by Norman Kling » Thu Jul 04, 2019 9:57 pm

Easy, just put your thumb in the spark plug hole and turn the crank. When you feel the compression, you know it is coming up on compression and when it reached the top it is at top dead center. You can double check to see if both valves are at closed at that point. If your crankshaft is drilled properly, the pin through the pulley should be straight across at top dead center and you pull it just a few degrees past that point to set the timing.
Norm

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Topic author
Oldav8tor
Posts: 2246
Joined: Sun Jan 06, 2019 11:39 am
First Name: Tim
Last Name: Juhl
* REQUIRED* Type and Year of Model Ts owned: 1917 Touring
Location: Thumb of Michigan
Board Member Since: 2018

Re: Timer Question

Post by Oldav8tor » Thu Jul 04, 2019 10:48 pm

Sheeesh... a senior moment. I use the same technique when doing compression tests on an airplane engine. I guess I'm just trying to make things more complicated.
1917 Touring
1946 Aeronca Champ
1952 Willys M38a1 Jeep (sold 2023)
1953 Ford Jubilee Tractor

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TRDxB2
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Re: Timer Question

Post by TRDxB2 » Thu Jul 04, 2019 11:50 pm

I hope this answers the initial question "I don't know which way to put the brush on the camshaft."
Attachments
NewDay Timmer brush.jpg
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