[Public-list] Old Atomic 4 Engine Mounts

[victoria youngaitis]

Brilliant!!


>From: Don Campbell <dk.campbell at sympatico.ca>
>Reply-To: Alberg 30 Public List -- open to all 
><public-list at lists.alberg30.org>
>To: Alberg 30 Public List -- open to all <public-list at lists.alberg30.org>
>Subject: Re: [Public-list] Old Atomic 4 Engine Mounts
>Date: Thu, 01 Feb 2007 09:40:31 -0500
>
>
>     The question of engine alignment is always one that those of us who
>do not do it every day might find daunting, particularly when we do know
>that if the shaft is not aligned, cutlass bearings will wear and perhaps
>other stuff that we did not expect will also wear. Both are probably
>correct.
>     I have written my method of alignment up for Towney for the upgrade
>of the manual that he is putting together, but that does not help for
>now. This is cheap and easy and with a much greater accuracy than the
>method CB Currier has suggested because it uses the length of the shaft
>to advantage for the measuring. I have copied this from a note I did
>write to one who was about to remove his A4 from an Alberg. This system
>works for any engine and any time.
>     I have had confirmation that the system works well by one Canadian
>owner who used a laser alignment system as well as the coat hanger
>needle and his comment was that the chap who owned the laser could not
>believe how accurate the coat hanger system was.
>     Perhaps the greatest problem is to know how many shims and rubber
>pieces are between the motor mounts and the beds. Trial and error are
>the guides here.
>Don # 528
>
>     The tricky part is to align the motor once it is to go back in and I
>have a set method for that which I find quite easy. I assume you know
>what, if any, washers need to go under the weight bearing brackets that
>hold the motor to the beds. Connect the drive shaft when you have the
>alignment close. Tighten those bolts up well on the coupler. Make a
>pointer out of coat hanger wire or equivalent and sharpen a fine point
>on the end of that wire. Bend it in such a way that the point of the
>wire can be set to just about touching (0.002") at the edge of the aft
>end of the  drive shaft and there are several bends now in the wire so
>that you can tape the wire to the rudder and the point will be secure
>and just about touch the end of the shaft at 12, or 9 or 6 or 3 o'clock
>places if there were a clock face on the after end.  Now using the prop
>if you are alone, or preferably with help from inside the boat, turn the
>shaft. If the point is in a constant alignment with the shaft, it is
>straight and the motor is set. If not adjust accordingly and continue
>until the point is fixed in relation to both a 12 and 6 set up and a 9
>and 3 set up. You need to do both so that the up and down and right and
>left alignment is adjusted. It helps to have a second person so that
>they can turn things and you can adjust from inside. You will find that
>even tightening the motor mount bolts bolts will change the alignment.
>     As an example if you set the wire point to 6 o'clock and turn the
>crank and the shaft rises above the wire, then the front of the motor
>needs to come up so add shims or tighten the back down. If you set the
>wire to 9 o'clock and the point moves into the shaft as it is turned,
>then the front of the motor needs to move to port. Just a bar or a small
>hydraulic jack with a big wooden block as backing on the firewall is all
>you need. Once you think you have things really close, then put the wire
>point on the centre of the shaft and turn it again. It should stay in
>the centre. Recheck things once in the water, and I usually get a pro in
>for that. I have never been more than 0.003 " out though. This takes a
>bit of getting used to the first time but is cheap and easy to do.
>Because it uses the leverage of the shaft to check on the deviation at
>the coupler there is at least  a 15: 1 leverage advantage so it is
>accurate too. Shaft is about 27" and the coupler is about 3" across, so
>1.5 " radius. Use the mechanical advantage to help you as best you can.
>
>
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