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TOPIC: compression testing and timing tools needed for a 1963 Merc 450

compression testing and timing tools needed for a 1963 Merc 450 09 Jun 2018 15:50 #85690

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The difference in using a buzz box and using an ohm meter is-one has to disconnect the condenser to use an ohm meter.After you get the correct setting you have to remove the cap again to reattach the condenser.A buzz box works with the condenser attatched.I've tried numerous mini tachs and had no luckwith the magneto on old mercs.Also on the flywheel of my mercs-there are timing marks for TDC and .235 BTDC.Have three motors and all of them have both marks.Didn't need any special tools or gauges.The shop manual is very clear in all the steps and order to follow to properly adjust carbs and timing.Good luck

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compression testing and timing tools needed for a 1963 Merc 450 08 Jun 2018 13:10 #85656

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Boatboy wrote: Just use an ohm meter.


That's exactly what I was thinking, your just checking for resistance, only difference is it doesn't make any sound. Plus I already own one.

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compression testing and timing tools needed for a 1963 Merc 450 08 Jun 2018 04:21 #85649

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Hawk eyes wrote: I just received my "Buzz box" and it is the easiest tool to use. No guessing what so ever. Buzzes when the points are open and stops when they closed.


Isn’t it so much better than an ohm meter? Clip on the leads and listen while you make the adjustments. It’s like having a second person. To me a buzz box is like a set of OMC timing tools. You don’t need them, but it’s so much nicer with them.
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Wayne
Hamilton, ON

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compression testing and timing tools needed for a 1963 Merc 450 08 Jun 2018 02:44 #85635

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When I set timing using the OMC timing tool I do not disconnect the points. I read the change in resistance when the points open and close. This way I don't have to disconnect anything, or reconnect. Only a digital ohm meter would work for this.

I've never used a buzz box but they have been around for a very long time and do work well from what I hear.

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compression testing and timing tools needed for a 1963 Merc 450 08 Jun 2018 02:22 #85631

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I just received my "Buzz box" and it is the easiest tool to use. No guessing what so ever. Buzzes when the points are open and stops when they closed.

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Mercury Marc, 1958 Hawk II, 1961 Merc 400 x2, 1955 Mark 25E. 1953 Mark 20

compression testing and timing tools needed for a 1963 Merc 450 08 Jun 2018 00:43 #85624

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Just use an ohm meter.

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John

1958 Vagabond II & 35 HP Evinrude
1955 PlastiCraft 12 Ft. Delux Runabout
1957 Clipper & twin 35 HP Evinrudes
1957 AlumaCraft 14 Ft. FD

compression testing and timing tools needed for a 1963 Merc 450 07 Jun 2018 16:51 #85612

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wbeaton wrote: It’s so much easier with a buzz box. It can be used with the ignition in place. Attach one lead to the magneto post and one to ground. I use it for all outboards. Well worth the price.

www.skygeek.com/action-air-22296-deluxe-...to-synchronizer.html


Would you be able to check when the points open with a regular volt meter checking for resistance ? Maybe I'm thinking about this incorrectly but had to ask as I'll be setting up the timing on my MK55 soon.

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compression testing and timing tools needed for a 1963 Merc 450 04 Jun 2018 17:31 #85583

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ALL RIGHT!!! that's the tool I have been searching the internet for the last 3 weeks..

Just placed my order

Thank you for sharing

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Mercury Marc, 1958 Hawk II, 1961 Merc 400 x2, 1955 Mark 25E. 1953 Mark 20

compression testing and timing tools needed for a 1963 Merc 450 04 Jun 2018 17:02 #85581

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It’s so much easier with a buzz box. It can be used with the ignition in place. Attach one lead to the magneto post and one to ground. I use it for all outboards. Well worth the price.

www.skygeek.com/action-air-22296-deluxe-...to-synchronizer.html
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Wayne
Hamilton, ON

1955 Vagabond I w/ 1955 Mercury MK55 50 hp
1957 Ranger III w/ 1957 Evinrude Big Twin 35 hp (sold)

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compression testing and timing tools needed for a 1963 Merc 450 02 Jun 2018 02:46 #85534

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Rick, and all,
I am now stuck on setting the BTDC Advanced timing part of my tune up on my 1963 Merc 450. The book says to use a magneto analyzer or a timing meter, I can not fine any of these tools online?

I am trying to use my standard volt tester to find out when the points open and dump electricity to the plug. but when I spin the flywheel nothing is reading on my tester?
will this tester work for what I am try to do, and do I have to drop the distributor cap to hook my tester wire to the non-grounded side of the points?

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Mercury Marc, 1958 Hawk II, 1961 Merc 400 x2, 1955 Mark 25E. 1953 Mark 20
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