Gimbal bearing install gone bad?

BigDog98

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Nov 12, 2013
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525
Re: Gimbal bearing install gone bad?

as in cut it out...or just to heat it up?
thanks for the crc freeze suggestion.

Just heat it up. Dont cut anything because once you have spark going all over the place you can explode because the gas tank is not far from the mounts.
 

mr300z87

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Sep 15, 2010
Messages
694
Re: Gimbal bearing install gone bad?

I was working on my Invaders 5.7L and had to replace one of the motor mount, it relatively easy to remove. Support the front of the engine with 2 x 4 across the gunnels and rope or chain. Remove 3 bolts that attach the bracket to the engine block and the 2 lags holding the mount it to the stringers. Pull out mount and bracket together so you can work on the bench. Do one side at a time. Reassemble and align. Also might try removing the exhaust for more working room. Good luck.
 

Speakrdude

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Feb 25, 2004
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Re: Gimbal bearing install gone bad?

+1 on removing the manifolds. Makes adjustments so much easier!~
 

bruceb58

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Re: Gimbal bearing install gone bad?

+1 on removing the manifolds. Makes adjustments so much easier!~
Depends on the boat. I can reach mine fairly easily on my Wellcraft. Some boats have their engine just ridiculously crammed in there though.
 

Searay D

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Re: Gimbal bearing install gone bad?

OK just an update of what iv'e done and learned.....I temporarily gave up trying to bust the lock nut loose....I took your guys advice and removed the manifold....WOW! what a difference ...I can actually work on this thing....It wasn't that easy ...it's just 8 bolts but...I wanted to make sure I didn't strip any on the way off and have to deal with that mess....The access to this motor is ridicules so I sprawled across my motor so I could get one hand in to verify I was on the nut and the other on the impact wrench...not comfortable but It worked.
once I got the manifold up up I took Bondo's advise and relieved some pressure on the adjusting nut...that made all the difference...now I could hit it with my big impact wrench took several minutes of hitting (lots of freeze off and PB blast)....but got it to move about 1/2 inch...I think that will give me enough room to make the adjustments..I was leery of try to take it all the way up as it was on there so tight I worried about snapping the bolt.....
The mount itself looks fine ...just rusted threads... Just a note for future guys ...my motor is a mercruiser 7.4.....the factory did a real swifty on the mount nuts....The top one is 1 1/16" the adjuster is 1 1/8"....hope that helps somebody...If I wasn't as carful as I was I could have made assumptions and stripped the nut....especially with the manifold on... and limited access...It would be easy to do.
Tomorrow it's the other side( with more rust) :facepalm: hopefull to do some adjustments soon.
 
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BigDog98

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Re: Gimbal bearing install gone bad?

OK just an update of what iv'e done and learned.....I temporarily gave up trying to bust the lock nut loose....I took your guys advice and removed the manifold....WOW! what a difference ...I can actually work on this thing....It wasn't that easy ...it's just 8 bolts but...I wanted to make sure I didn't strip any on the way off and have to deal with that mess....The access to this motor is ridicules so I sprawled across my motor so I could get one hand in to verify I was on the nut and the other on the impact wrench...not comfortable but It worked.
once I got the manifold up up I took Bondo's advise and relieved some pressure on the adjusting nut...that made all the difference...now I could hit it with my big impact wrench took several minutes of hitting (lots of freeze off and PB blast)....but got it to move about 1/2 inch...I think that will give me enough room to make the adjustments..I was leery of try to take it all the way up as it was on there so tight I worried about snapping the bolt.....
The mount itself looks fine ...just rusted threads... Just a note for future guys ...my motor is a mercruiser 7.4.....the factory did a real swifty on the mount nuts....The top one is 1 1/16" the adjuster is 1 1/8"....hope that helps somebody...If I wasn't as carful as I was I could have made assumptions and stripped the nut....especially with the manifold on... and limited access...It would be easy to do.
Tomorrow it's the other side( with more rust) :facepalm: hopefull to do some adjustments soon.


Sounds as if now everything is going smoothly. And good thing you realized about those adjusters nuts being 1 1/16" & 1 1/8". Hope everything goes well from there. And once those manifolds are off it makes the difference in the world. Good luck on the rest. :)
 

Searay D

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Re: Gimbal bearing install gone bad?

Sounds as if now everything is going smoothly. And good thing you realized about those adjusters nuts being 1 1/16" & 1 1/8". Hope everything goes well from there. And once those manifolds are off it makes the difference in the world. Good luck on the rest. :)

I guess I'm winning the stubborn contest....finally got the rusty side lock nut to move up about a 1/4 inch.....took a whole can of freeze off....being able to get the impact gun is the only thing that made this job possible....I'm down to one rusty adjustment nut thats giving me a hard time....after that it's alignment city...going to soak it overnight and try again tomorrow.
 

bspeth

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Re: Gimbal bearing install gone bad?

Remember to keep the adjustments the same on both sides.
 

Searay D

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Re: Gimbal bearing install gone bad?

Ok...I need a little help please...Here's where i'm at...I've adjusted the front mounts and I'm able to insert the tool to the bottom and pull it back out with 2 fingers pretty easily...My question is..My alignment tool comes out with deep marks on the Starboard side...When I insert the tool and hit the splines there's a little clunk( just barley) before the tool enters the splines...is that normal? If I adjust 1 flat in either direction it's not as easy to remove the tool...so I think I'm dead on...You guys have said that side to side is rarely an issue...but is this one of those rarities..and If so..where do I go from here...Thanks for all the advise.
 

bspeth

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Re: Gimbal bearing install gone bad?

turn you engine over 90 degrees and insert the bar,then 90, then 90,continue with adjustments to balance out all four quadrants.Then tighten the top nuts and check again. If it changes you are not level,if it doesn't you are done.You really can fine tune it if you make small adjustments.Put a piece of tape on the balancer to mark the increments. Good luck.
 

Searay D

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Re: Gimbal bearing install gone bad?

turn you engine over 90 degrees and insert the bar,then 90, then 90,continue with adjustments to balance out all four quadrants.Then tighten the top nuts and check again. If it changes you are not level,if it doesn't you are done.You really can fine tune it if you make small adjustments.Put a piece of tape on the balancer to mark the increments. Good luck.

Great minds think alike:lol: while I was waiting for replies I did exactly what you suggested at 180% the tool was hard to go in and out making some adjustments to try and balance it out....found this quote from 2010 from Don S. so i guess that answers my previous question

How the bar comes out of the coupler is more of an indication of the alignment than how it goes in. If it pulls easily out of the coupler with no resistance (or very, very little) then the alignment is fine.
Read this thread, and watch the video's http://forums.iboats.com/mercruiser...drive-alignment-woes-input-needed-382029.html.
 

Searay D

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Re: Gimbal bearing install gone bad?

bspeth?
did you tighten the top lock nut before you rotated the engine when you did your job....I read in an old post that your suppose to do that...I have not been doing so...and in your old post you didn't mention it....
 

84EdH

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Re: Gimbal bearing install gone bad?

the idea is to leave the top nuts loose, make all your fine tune adjustments, with 90 degree engine turns. when you have it right. Then tighten the top nuts. the alignment (ease of insertion and removal of alignment bar) should not change. If it does change, it means one side of the bottom nuts is not the same height as the other. loosen top nuts, raise or lower one bottom nuts so they are both lifting the same, then go back to your alignment procedure, get the bar going in and out easy, check 90 degree turns. tighten top nuts, and again, the aligment should not change.

example: if the port side lower adjustment nut is 1/8th inch lower than starboard side. you might have the alignment seemingly right with easy bar insertion/removal with top nuts loose. then you tighten the top nut on starboard side. check alignment: no change, still smooth. then you tighten port side top nut. as you tighten the nut to specs, it pulls the front port side of engine down, and now your alignment bar is not going in as easy. remedy by loosen top nut, raise port side bottom nut, then repeat alignment, tighten top nuts again until no change in alignment. (if you had both bottom nuts lifting equally earlier in your alignment process, and you made equal adjustments to each nut during alignment, there will be no change when top nuts tightened.)
 

Searay D

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Re: Gimbal bearing install gone bad?

the idea is to leave the top nuts loose, make all your fine tune adjustments, with 90 degree engine turns. when you have it right. Then tighten the top nuts. the alignment (ease of insertion and removal of alignment bar) should not change. If it does change, it means one side of the bottom nuts is not the same height as the other. loosen top nuts, raise or lower one bottom nuts so they are both lifting the same, then go back to your alignment procedure, get the bar going in and out easy, check 90 degree turns. tighten top nuts, and again, the aligment should not change.

I'm working on the fine tuning now...I think the port and starboard nuts being unbalanced is the culprit. at 12 o'clock its butter..When I rotated 90% it got a little more snug...when I rotate to 180% the bar is super tight...marks on the bottom so I turn 4 flats up. comes out now but not like butter...rotate back to 360%(12 oclock) It's like butter.
I'm thinking tomorrow do a test tightening on the mounts and see if I can fix any highs or lows on the adjusting nuts, then rotate again and see if I can zero it in.
Whats interesting to me is 12 o'clock is still butter even after coming up 4 flats in the 6 o'clock position. I'll see what tomorrow brings...
Thanks for the feedback

example: if the port side lower adjustment nut is 1/8th inch lower than starboard side. you might have the alignment seemingly right with easy bar insertion/removal with top nuts loose. then you tighten the top nut on starboard side. check alignment: no change, still smooth. then you tighten port side top nut. as you tighten the nut to specs, it pulls the front port side of engine down, and now your alignment bar is not going in as easy. remedy by loosen top nut, raise port side bottom nut, then repeat alignment, tighten top nuts again until no change in alignment. (if you had both bottom nuts lifting equally earlier in your alignment process, and you made equal adjustments to each nut during alignment, there will be no change when top nuts tightened.)
123
 

bspeth

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Re: Gimbal bearing install gone bad?

make the adjustments at the 6 oclock position,then rotate and check.Top nuts loose as Ed says.Just keep fooling with it and you WILL get it! Its well worth the extra time it takes,you will sleep better when you know its right.-B
 

Searay D

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Re: Gimbal bearing install gone bad?

make the adjustments at the 6 oclock position,then rotate and check.Top nuts loose as Ed says.Just keep fooling with it and you WILL get it! Its well worth the extra time it takes,you will sleep better when you know its right.-B
NOt perfect..I did the best I could do... can pull out with 2 fingers at 12 3 6 9....about 10 hours....I'm putting her back together...wish me luck!
Thanks for everyones help much appreciated!!
 

bspeth

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Re: Gimbal bearing install gone bad?

sounds like you are good D.
 

Searay D

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Re: Gimbal bearing install gone bad?

sounds like you are good D.


Just wanted to wrap things up.....I put everything back together and it' looks as if everything is working as it should hope to be on the water this weekend.....I just wanted to say thanks to all who helped...couldn't have done it without your help...I hope to pay it forward and help someone in the future.....

Just a tip for someone following in my footsteps...reinstalling the manifolds was a real pain on my boat...it's a 454 stuffed tight in the engine bay..and side access is a joke...I had to tie a rope around the manifold cinch it over a 4x4 I laid across the back of the boat and lower it in...all the while trying to keep the gaskets aligned....Major pain...advice:get a friend
 

tpenfield

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Re: Gimbal bearing install gone bad?

Just FYI for future needs . . .

Another technique for those 454 manifolds is to get a couple of studs (or hack the head off a couple of compatible bolts) and put them in two of the more center located bolt holes on the exhaust ports of the cylinder head. Then you can slide on the gasket and mount the manifold in place. The studs will take the weight of the manifolds, keep the gasket fairly aligned, while you fasten the remaining bolts. Then remove the 2 studs and put the last 2 bolts in.
 
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Searay D

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Re: Gimbal bearing install gone bad?

Just FYI for future needs . . .

Another technique for those 454 manifolds is to get a couple of studs (or hack the head off a couple of compatible bolts) and put them in two of the more center located bolt holes on the exhaust ports of the cylinder head. Then you can slide on the gasket and mount the manifold in place. The studs will take the weight of the manifolds, keep the gasket fairly aligned, while you fasten the remaining bolts. Then remove the 2 studs and put the last 2 bolts in.

Genius ....I guess I should have asked :eek: I''do that next time for sure!!
 
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