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Ted Markow
New member
Username: tedm2
Post Number: 1
Registered: 11-2009
| | Posted on Thursday, November 05, 2009 - 09:53 am: | 
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I need to replace my 86 DP290A and have seen some newer 290 versions available. I am trying to find out if they are compatible to the existing transom shield, fork, intermediates, lowers, etc. Are they as dependable as the older models?
Here is a picture of a newer model i have located.
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Ricardo E.
Advanced Member
Username: ricardomarine_vp
Post Number: 740
Registered: 03-2009
| | Posted on Thursday, November 05, 2009 - 10:34 am: |
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Ted, The drive shown is not a DP A drive..... not with the tilt/trim cylinders making a direct connection to the main suspension fork as you have shown here.
The "A" drive will use the reverse latch unit.... whereas the later ones eliminate this!
The "A" drive transmission is similar to a 275 A drive or an SP A drive.
This one shown would be more like a DP "C" or "C 1" drive, of which uses a larger driven gear bearing diameter making the transmission a little stronger unit.
If you were to use the entire drive, minus the suspension fork, it may work.
This would involve removal of the pivot tube and re-assembly.
If you were to change transom shields to the C style, this would work for you!
All AQ series lower units are interchangeable if you perform the necessary shimming of the vertical shaft tapered roller bearing race!
(be sure to keep the original race with it's counter part!)
In fact, this shimming is necessary when changing any components from one Intermediate to another. It is a critical part of any swap!
Just an FYI on that!
The C lower unit may also have the short vertical shaft that requires the longer vertical shaft coupler.
What is it that you wanting to do?
I work on these and have people from various states ship to me for repairs.
Be glad to help if I can!
BTW, what some call the large pin 290 are not actually a 290 (the one shown, for example)...... this is a common misnomer!
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Ted Markow
New member
Username: tedm2
Post Number: 2
Registered: 11-2009
| | Posted on Thursday, November 05, 2009 - 11:23 am: |
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A bearing in the upper unit came apart and has left scaring on the intermediate housing where it tapers to the drive shaft and also destroyed the teeth of the lower gear set. I have a spare 1988 lower (of course without the original race)to use and am trying to piece the rest back together. By chance can I re-surface the intermediate at a machine shop? I can not determine if anything rides on the tapered section. I had all of the intermediate parts replaced last year and would like to save them if possible. |
Ricardo E.
Advanced Member
Username: ricardomarine_vp
Post Number: 743
Registered: 03-2009
| | Posted on Thursday, November 05, 2009 - 11:45 am: |
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Ted, I am not following you re; the "Intermediate parts" or the "tapered section".
The Intermediate housing holds the one tapered roller bearing race for the lower unit, and it captures and clamps the transmission's "lower driven gear bearing" placing a non-conventional "pre-load" on it (so to speak), to keep it from spinning.
Other than that....., it has no moving/rolling/bearings to it pertaining to the actual drive unit...... it serves as a mounting unit only for the transmission and lower unit!
Maybe some photos would help me to understand this and/or help you explain your question!!!!
(Email me or post here. I'll check back!)
Replacing lower unit gears/bearings is often cost-ineffective on the Duo Prop..... gears/bearings and set up time cost can get up there pretty quickly! This set-up is not for an inexperienced person to attempt, IMO.
RE; the vertical shaft race!
If you do not have the original race, then a solution is to replace the entire bearing!
It is not an expensive bearing and can be purchased via a bearing supplier!
(an array of shims will need to be via Volvo Penta)
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Ted Markow
New member
Username: tedm2
Post Number: 3
Registered: 11-2009
| | Posted on Thursday, November 05, 2009 - 02:13 pm: |
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The intermediate parts are the seals, bearings & water tube that go through the intermediate to the suspension fork. I would like not to have to take all apart again.
If you look straight down at the top of the intermediate housing where the upper sits in/on it, the intermediate tapers down to where the vertical shaft comes up through the housing. It looks like it may be a bearing race of stop for the upper. It does not appear that the bearing on the bottom of the upper rides on it but I may be wrong. |
Ricardo E.
Advanced Member
Username: ricardomarine_vp
Post Number: 744
Registered: 03-2009
| | Posted on Thursday, November 05, 2009 - 06:31 pm: |
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Quote:
(1) "A bearing in the upper unit came apart and has left scaring on the intermediate housing where it tapers to the drive shaft and also destroyed the teeth of the lower gear set"....................................
(2) "By chance can I re-surface the intermediate at a machine shop? I can not determine if anything rides on the tapered section."
(3) "I had all of the intermediate parts replaced last year and would like to save them if possible."
(1) OK.... I see what you are referring to now! gotcha!
(2) The lower unit vertical shaft and the transmission vertical shaft both share this bore.
A minor amount of scaring should be of no issue if not at the bearing "seating" surface!!! (post a photo for us)
The large portion of the bore performs two important tasks:
a) the upper most O-ring groove for compressing the driven gear bearing seal (O-ring).
and.....
b) the driven gear bearing "seat" (the area that we shim to obtain the correct compression against bearing).
So yes, the design allows for the lower driven gear "bearing" to contact this smoothly machined area of the Intermediate housing as to control any up/down movement!
If this is not scared, you will be OK, IMO!
(3) OK.... The Pivot tube and Main suspension fork needle bearing cage and seals, pivot tube bushing, nylon washers, SS washer, etc...... all have more to do with the "Fork" than the actual "Intermediate housing"!
Regarding saving the parts during disassembly, etc???? ..... I'd not let that be a deal-breaker.... the parts are easily salvageable upon disassembly and re-assembly! Some of the few parts, I may add, that CAN be removed and reused. (Been there/done that!)
Other than that......... all sounds pretty normal to me!
Sorry that you lost a lower gear set! Not good! |
Ted Markow
Member
Username: tedm2
Post Number: 4
Registered: 11-2009
| | Posted on Tuesday, November 24, 2009 - 09:01 am: |
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In your first reply you say that the DP-C "MAY" fit if the suspension forks were swapped. Are there any units that "WILL" swap out? I can find units listed as 290 SP ,290SP-A, 290SP-CD and the DP-C's. These seem to be much easier to come by.
Will the AQ lower units fit these? |
Ricardo E.
Advanced Member
Username: ricardomarine_vp
Post Number: 805
Registered: 03-2009
| | Posted on Tuesday, November 24, 2009 - 09:40 am: |
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Ted, An entire range of AQ series lower units will interchange with the correct shimming being performed.... 200, 250, 270, 280, 275, 285, 290, SP, SPA, SPC, DPA, DPC, DPD & E (although diesel), and so on, just to mention some of them.
Any and All lowers will interchange up to, and NOT including, the SX or DP S style drives where the design changes to a Gimbal suspension system.
NOTE: not all transmissions (upper units) will interchange.
The AQ series (or what most call the AQ series) uses a main suspension fork type suspension.... and pivot tube articulation..... NO GIMBAL system!
I am fairly certain that the suspension fork should interchange if you were to remove the pivot tube. Many of the parts are same.... so it should work!
Shoot me an email whereby you can send photos easily.
Label each photo for clarity.
I'd be glad to tell you what you are looking at.
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