Mark 28 issues

Home Forum Ask A Member Mark 28 issues

This topic contains 31 replies, has 12 voices, and was last updated by Tubs Tubs 2 years, 8 months ago.

Viewing 15 posts - 16 through 30 (of 32 total)
  • Avatar
    wedgie

    Notice: Trying to get property of non-object in /home/aomcio5/public_html/wp-content/themes/monstroid2/bbpress/loop-single-reply.php on line 19

    Replies: 966
    Topics: 94
    #47129

    Maybe I should go get some stp

    I can’t even get the bottom piston in using hose clamp and Popsicle sticks. It’s hard to keep the rings from spinning and getting misaligned with the pins. I tried the pop can and zap strap with no luck either. I might have to take it to someone who has the correct ring compressors.

    Would a set of new rings would go in easier ?

    Avatar
    dave-bernard
    US Member - 2 Years
    Replies: 893
    Topics: 10
    #47133

    biggest key is to clean the grooves really clean makes a big difference.

    Avatar
    wedgie

    Notice: Trying to get property of non-object in /home/aomcio5/public_html/wp-content/themes/monstroid2/bbpress/loop-single-reply.php on line 19

    Replies: 966
    Topics: 94
    #47142
    quote Dave Bernard:

    biggest key is to clean the grooves really clean makes a big difference.

    Thanks Dave, that’s good to know. I’ll give that a try.

    Avatar
    billw
    US Member - 2 Years
    Replies: 1028
    Topics: 35
    #47162

    With no proper compressors, it’s certainly harder. However, what can be done to help is cut some small blocks of wood to pile up and support each end of the crank, over the block. Make the blocks at least 6 inches long, because the crank is going to want to roll one way or another; so the blocks must be stable. This gives you a free extra hand, to work the rings. Just pull out an appropriate-size block, at each end, as you start to lower it in. Also, custom-cut teak or oak sticks are a little more robust than Popsicle sticks, for working the rings.

    Avatar
    20mercman
    US Member - 2 Years
    Replies: 583
    Topics: 21
    #47176

    I agree that the grooves should be clean. When I do this, I concentrate on one ring at a time. I get them aligned with the locating pins as close as I can. I then insert the first ring. You may have to rotate the crankshaft slightly one way or the other so the rings can find their place on the locating pins. The STP really helps. After the first ring slides in, concentrate on the next while being careful to not over stress them and break them. These are much easier than the 11 cid. 9.8 hp. motors as you have a bit more room for your fingers. I often mark the rings with a marker so I know where they need to be to fit into the locating pin. After the first cylinder is in, rest your hands a moment or two and then move on to the other one. Like I posted, I find that putting the bottom cylinder in first makes it easier. You most likely will have the top cylinder rings all moved while working on the other piston, so it is much easier to see them plus you have more room to work. Also, as was mentioned, Oak is a better wood than popsicle sticks, even a brass or metal rod etc. that can slide on the STP. I used to use them on Hurricane blocks, but now I just use a hose clamp on them. Take your time.

    My confidence is high!

    Steve

    Avatar
    wedgie

    Notice: Trying to get property of non-object in /home/aomcio5/public_html/wp-content/themes/monstroid2/bbpress/loop-single-reply.php on line 19

    Replies: 966
    Topics: 94
    #47180

    Thanks for the encouragement. I always figure if you guys can do it barehanded then so can I. But then again there’s always that 10 year old that can solve a rubics cube in under a minute.I still cant do it after 30 + years.

    I am coming up with a simple jig to hold the block still and support the crank so I can keep both hands free to poke the rings home . On the lookout for a couple of pieces of hardwood.

    Avatar
    wedgie

    Notice: Trying to get property of non-object in /home/aomcio5/public_html/wp-content/themes/monstroid2/bbpress/loop-single-reply.php on line 19

    Replies: 966
    Topics: 94
    #47186

    Now to find some hardwood scraps. 😉

    Avatar
    wedgie

    Notice: Trying to get property of non-object in /home/aomcio5/public_html/wp-content/themes/monstroid2/bbpress/loop-single-reply.php on line 19

    Replies: 966
    Topics: 94
    #47194

    Yay !

    Thanks everyone for putting me on the right track. I found I had to jiggle and wiggle the piston "just-so" to get the rings to work themselves into the bore. No way to do that without the jig to hold most of the weight.

    So now is a good time to ask about the correct orientation of the bottom crank seals. Both facing like this?

    IMG_20161108_154459.jpg[/attachment]


    Attachments:

    Avatar
    20mercman
    US Member - 2 Years
    Replies: 583
    Topics: 21
    #47201

    Glad to see you got them in. Like I said, my confidence was high! 😉 The 26-16977 is the replacement seal. They are double lip seals. I can’t tell from your photo if these are double seals or not. I always install those as original with the open end of the seal facing the retainer, so in other words the other way. Your old seals will have witness marks on them from the retainer.

    Steve

    Avatar
    wedgie

    Notice: Trying to get property of non-object in /home/aomcio5/public_html/wp-content/themes/monstroid2/bbpress/loop-single-reply.php on line 19

    Replies: 966
    Topics: 94
    #47202

    Glad I asked Steve. Thanks. I will have a close look and see if they are double seals.

    Avatar
    billw
    US Member - 2 Years
    Replies: 1028
    Topics: 35
    #47214

    Seal lips face down.

    Avatar
    wedgie

    Notice: Trying to get property of non-object in /home/aomcio5/public_html/wp-content/themes/monstroid2/bbpress/loop-single-reply.php on line 19

    Replies: 966
    Topics: 94
    #49659
    quote BillW:

    Seal lips face down.

    Thank you Bill , and thanks to everyone, it’s back together with a few dollars in parts from Joe Poole. I used permatex anaerobic flange sealant. I shimmed the gearcase by feel, so I hope I got it right. Now that it’s running I will have to follow up on the starter recoil.

    http://vid61.photobucket.com/albums/h57 … jzqurp.mp4

    Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 4185
    Topics: 424
    #49680

    That motor sounds great Wedgie! How long since it last ran and how did you like the sealer?

    Avatar
    david-bartlett

    Notice: Trying to get property of non-object in /home/aomcio5/public_html/wp-content/themes/monstroid2/bbpress/loop-single-reply.php on line 19

    Replies: 1228
    Topics: 105
    #49681

    Very nice. I have a Mark 10 that I will be starting on soon. Very cool motors.

    Avatar
    wedgie

    Notice: Trying to get property of non-object in /home/aomcio5/public_html/wp-content/themes/monstroid2/bbpress/loop-single-reply.php on line 19

    Replies: 966
    Topics: 94
    #49705
    quote Mumbles:

    That motor sounds great Wedgie! How long since it last ran and how did you like the sealer?

    I had it running at least 5-6 years ago, but the case leaked, so I put it away until recently. The sealer is easier to work with than the scotchgrip as it is not as stringy/sticky when applying it. Gave it more than a week to cure because the test tank was frozen solid.

    I think today I will pop in some Atom modules and see if that will improve the idle.

Viewing 15 posts - 16 through 30 (of 32 total)

You must be logged in to reply to this topic.