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Message |
    
Justin
Member
Username: thisjustin
Post Number: 14
Registered: 10-2009
| | Posted on Wednesday, November 18, 2009 - 03:48 am: | 
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Hey guys, it's me again
So here's the situation. I got this picture...
http://www.volvopentastore.com/Upper_Gear_Unit_Drive_275/dm/cart_id.906125189--s ession_id.672438403--store_id.366--view_id.324030
I need to know, is there supposed to be a gasket between the upper gear box and the intermediate housing like the gasket between the gear housing cover (top cap) and the gear box ( #10 in the picture)? It would make sense to me if there is but the picture doesn't show it and it's not shown on the exploded view of the intermediate housing...which is here...
http://www.volvopentastore.com/Intermediate_Housing_Drive_275/dm/cart_id.9061251 89--session_id.672438403--store_id.366--view_id.324084
I plan on ordering 2 just because it makes sense to me. However, I have another problem.
I think my vertical shaft is bent. I'm not sure. I have to take it back to the shop and see. When I turn the shaft with both the top gear and the bottom gear installed and the shift mech hand tightened, the shoe moves up and down slightly. Should I put it together without the sliding sleeve and check the splines on the shaft with a dial indicator or is slightly out...ok?
I can explain more if you need it, I just didn't want to write a book
Justin |
El Pescador
Senior Member
Username: el_pescador
Post Number: 5019
Registered: 02-2006
| | Posted on Wednesday, November 18, 2009 - 05:47 am: |
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What you are looking for is gasket #7 on top of the intermediate housing.
http://www.volvopentastore.com/Intermediate_Housing_Drive_275/dm/cart_id.9061251 89--session_id.672438403--store_id.366--view_id.324084 |
Justin
Member
Username: thisjustin
Post Number: 15
Registered: 10-2009
| | Posted on Wednesday, November 18, 2009 - 06:32 am: |
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No. I have the #7 o-ring. There's a little groove or shoulder or whatever you want to call it in the top cap (on top of the gearbox) where the gasket #10 fits. In the top of the intermediate housing there is a shoulder or groove, etc... that matches it. I'm asking if there's supposed to be another gasket.
I have pictures of it but I can't upload them here. It keeps telling me that they're too big. |
Ricardo E.
Advanced Member
Username: ricardomarine_vp
Post Number: 775
Registered: 03-2009
| | Posted on Wednesday, November 18, 2009 - 08:27 am: |
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I am reluctant to correct our Mr. El P here, he contributes very generously to the forum here.
However, to avoid any confusion, Justin....... #7 is an O-ring.
There are only two gaskets in a 275!
Top case cover (#10), and the fill plug gasket (#6).
The rest are O-rings and lip seals.
O-ring #7 is placed over the lower driven gear bearing "retainer"...... and the oil drain back O-ring (p/n 125017) is placed over the drain tube of the Intermediate housing!
These are the only two means of any seal between the transmission and Intermediate housing.
(lower unit-to-Int-hsg O-ring sealing is very similar with exception of there being one additional O-ring for the pivot tube.... three total!)
Justin, #10 (p/n 832669) is a rubber gasket with a special "loop" in it for the top gear case cover/cap hollow bolt.
As for your "bent shaft"..... Doubt that you have one!
Here's why:
The sliding sleeve's shift shoe "groove" is machined into the sleeve eccentrically.
The intent is to create a slight hammering effect when a shift shoe is about to move a sliding sleeve from IN GEAR back to NEUTRAL! This action helps release cup engagement.
This is why you feel the shift shoe wanting to be raised slightly UP/DOWN as the sleeve rotates while in gear (or if the prop shaft is turned).
If you have further concerns, use a dial indicator on the shaft and check for run-out..... doubt that you will find any!
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Justin
Member
Username: thisjustin
Post Number: 16
Registered: 10-2009
| | Posted on Wednesday, November 18, 2009 - 11:23 am: |
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Huh, I didn't notice the cut-out for that special "loop" in that gasket. I'm glad you pointed that out. I was just looking at the top of the intermediate housing and there is a little shoulder matching the one in the top case cover only without that loop. That is why I thought maybe there should be another gasket. So as long as I put a little gasket sealer in between the two I should be good to go. Right?
As far as the shaft goes, I never considered that hammering effect you were talking about. That makes sense. I considered the possibility that it was bent because it was the upper bearing that seized up and trashed the retainer and shims. With it back together the clearance underneath the nut on the top of the shaft is perfect on one side and nothing on the opposite side. I was just worried about excessive vibration and trashing the bearings again.
Thank you guys for all of your info and help. I'm new at this and they don't put these little details in shop manuals. Your expertise has been invaluable. Thank you.
Justin |
El Pescador
Senior Member
Username: el_pescador
Post Number: 5020
Registered: 02-2006
| | Posted on Wednesday, November 18, 2009 - 11:36 am: |
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No problem with you correcting me, Ricardo. If you look at the exploded view, part #7 is defined as an o-ring anyway. |
Ricardo E.
Advanced Member
Username: ricardomarine_vp
Post Number: 776
Registered: 03-2009
| | Posted on Wednesday, November 18, 2009 - 02:27 pm: |
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Justin, Typically (for me anyaway) O-rings and Gaskets like this require no sealant. I do use water proof grease only as to lube them as they nestle into place.
However, on any of these drives that are slated to be salt water used, I will use either Perfect Seal or PT #3 on them.
Others may do differently!
I also use the Perfect Seal when installing any of the seals.
With the now-new-info re; the top nut, you'd better check things.
I will say this; It requires a tremendous amount of torque to bend or harm on of these vertical shafts. Usually gear failure accompanies it!
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