Cutlass bearing play? |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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Posted: February-06-2017 at 3:01pm |
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I just bought a brand new cutlass bearing from deepblueyachtsupply.com. The new bearing has the same amount of vertical and horizontal movement as the old one. How much "play" is acceptable? Should I be concerned that I can wiggle the bearing? It is probably moving, freely, 1/32 to 1/16 of an inch. Probably closer to the 1/32 side.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Josh,
If you can wiggle the shaft, somethings not correct. What does the shaft measure out to? Is the shaft worn at the cutlass? Measure there as well as in the middle to get an idea. EDIT: Is the play between the shaft and cutlass or the cutlass and strut? |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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The play is between the cutlass bearing and the shaft. It is loose or able to wiggle at any point along the shaft. I need to get a battery for my micrometer so I can get some measurement.
I slid the cutlass bearing onto the shaft with out placing it into the strut. Is there a possibility that upon pressing the bearing into the strut it will tighten the bearing up some? |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Josh,
The press fit of the cutlass into the strut isn't enough to make a difference in the ID of the bearing. Get the measurements. |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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OK, I took some micrometer readings:
The area where the cutlass bearing sits reads .998" at the smallest and 1.006 at the largest. Up high on the shaft near the hull the largest reading is 1.014. The id of the new cutlass bearing is 1.005. So it looks like I am running a difference of .007 to -.001 along the bearing area. I don't know what that means really, other than is some places the shaft is a bit narrower than the bearing and others its a bit larger. Do I need a new shaft? |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Josh,
That .016 difference in shaft diameter isn't normal. There's always a tolerance on shafting typically + or - .001 but it's consistent through the length of the shaft. Do you know if the shaft has been changed out at one time? I wonder if it's a home made shaft?? The concern now however, is where the shaft runs in the cutlass. I would call Deep Blue and see what the cutlass tolerance is. I have never run into one that's over the 1" typically, they are .001 to .002 under the 1". |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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This is what they told me:
Josh, The bearing is correct. They are water lubricated bearings, so once the boat goes in the water, water will fill through the grooves and create a "film" around the shaft. Mike |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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And after a follow up email to clarify, I got this:
Joshua, If the diameter on the pads were smaller than 1", then the bearing would instantly wear upon use or worst case, wear the shaft. The bearing is not meant to be tight on the shaft. |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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What is the worst case scenario if I run it and it is a little too loose?
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Some vibration. See how the boat runs and report back. BTW, I feel Deep Blue isn't entirely correct. Yes, the water is the lubricant but the .998 to me is on the large end. Who's the manufacturer of the cutlass? Morse? |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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The manufacturer is Johnson. I will assemble it and let you know how it goes. Thanks for the input.
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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I too put a new cutlass bearing in with new General Prop shaft & it had some play.
I only get some vibration in reverse. A small amount of cutlass play does not affect shaft alignment at the tranny. |
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“Beer is proof that God loves us and wants us to be happy.”
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10680 |
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What are you trying to say here Pete? Sounds like you want to put a 1 inch shaft into a cutlass bearing that's .998 or .999 That would be pretty silly. Must need a big hammer to do that. I gotta agree with the Deep Blue e mails that Josh got and with SNObsessed too. .005 clearance for a 1 inch shaft seems to be the accepted number, |
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Having dealt with bushings and sleeves on a daily basis in my trade, I think some of you are a little misinformed about interference fits. Especially on thin walled sleeves which is what we are dealing with here, When you have say a .005 interference or press fit on the O.D. of the sleeve then when installed the I.D. also compresses a like amount.
That said, a sloppy bushing I.D. before installation in the strut will not be as sloppy when pressed into the strut. That was exactly the case with the bearing that I ordered from the same supplier. Press it in and then check what you have. Be very careful to keep it straight when you start installing. Helps some to freeze the bushing and heat the strut some. I would not go over 250 degrees. Work fast. Quench with wet towel |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Ken, You are correct that my wording is backwards. Thanks for catching it. Restating, on a 1" shaft, there should be .001 to .002 clearance and I feel the .005 is excessive. The rubber is resilient and unlike a hard metal or plastic bushing does "give" slightly. The .001 to .002 is plenty of space for the water film. My background with brass shelled rubber bushing goes way back and beyond marine prop shafts. At my first job, we would buy the Morse 1" by quantities of 100 for a water lubricated bearing application. One thing of interest is the higher the SFPM, the tighter you need to be on the clearance. We would shoot for .001 at 3600 RPM |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10680 |
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So, to simplify this................Josh has the proper cutlass bearing for a 1 inch shaft
Now as far as his shaft goes, once the bearing is in the strut, you'll know how the shaft really fits |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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Thanks for all the responses. It is all together and looks great. I plan on taking it out for a test run tomorrow with my son. He gets to miss school so he is pretty excited. I will post the results. This is my first inboard, so I very much appreciate the help. Here is picture
I picked it up for $1500. Stringers are solid and it runs great. I had the misfortune to hit a rock on the first day out. The good is that I got a brand new acme 540 out of it!! |
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Great looking boat.
You stole it for $1500! |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Josh,
Hopefully you checked the strut to log alignment and then moved forward to the engine alignment? |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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That is how I did it. It was a bear to get the engine alignment right but with enough persuasion on those mounts I was able to get the engine to slide over.
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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Took it out today. It ran great. No noticeable vibration. I was doing 41 GPS with the acme 540. Does that sound about right? The tach read about 4000 rpm. Don't know how accurate it is though. Also, The steering cable broke. Made for a fun ride back. Where is the best place to buy one? Seems like by the time I am done I will have a nearly new boat.
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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My son at the helm.
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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$309 for a new steering cable from nautiqueparts.com?? That is steep.
http://www.nautiqueparts.com/product/steering-cable-all-nautiques-from-1982-to-1990/ |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21115 |
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Tach vs speed looks correct with that hull and prop/.. but youre missing 400-500rpm (4-5mph) worth of performance (assuming you're not a mile above sea level). How's the engine tune?
82-90 cable is cc-specific. Use the 10% discount code, that's the best you'll do. |
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joshjanae
Groupie Joined: October-11-2015 Location: Arizona Status: Offline Points: 87 |
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Guess, I have to bite the bullet on the cable. The engine runs great. It is a new to me boat and I have only had it on the lake twice. I should probably do a complete tune up on it. Its only money right!! So far I am 2k into this boat but I'm still grinning form ear to ear. Also, the elevation of the lake is about 1650 feet.
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rolleronariver
Senior Member Joined: May-24-2016 Location: Rogers, AR Status: Offline Points: 195 |
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$2k is unreal for that boat. Great buy!
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92 Sport nautique
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quinner
Grand Poobah Joined: October-12-2005 Location: Unknown Status: Offline Points: 5828 |
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10% off code is PND @ Nautique Parts
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Kegs319
Newbie Joined: May-09-2017 Location: Cincinnati, OH Status: Offline Points: 1 |
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New Member here. I just bought a '90 Sport nautique and have been reading up on this steering cable stuff. I've read that '82-'90 was a CC proprietary cable of 17.5 ft. My question is as long as the travel is the same at the "tiller", why couldnt you adapt into a 18' cable? i.e. Teleflex Thanks for the input.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21115 |
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You mean use a shorter throw cable and a shorter tiller arm in order to keep rudder travel the same? Sounds like a recipe for increased steering effort.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Increased steering effort plus increased strain on the components! Sounds like a problem to me. CC didn't go out and have special throw cables made just so they could charge extra $$ for them! Brian, How's your liability insurance?? |
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