Can someone look under their Merc? - PT sender.

9D280 · 19 February 2013, 20:07

OK, phase 276 of the rebuild / improvement scheme!

I have become aware that some Merc PT senders are bolted to the swivel bracket and engage on a slot in the top ram pin that is pinned to the ram, rather than the older design wich was pinned to the swivel. Nowm, as my engine is a bag of bits I am reckoning I could modify my pin, and judiciously drill / tap 3 holes to locate it & fit the sender to.

So, could someone with one of these senders do me a quick favour & have a look under the swivel bracket. The microfiche implies from it's sketch that the slot for the sender in the end of the pin is parallel to the hole for the locking pin. IF you can see that without dismantling, can anyone confirm?

Other theory is that the hole in the top of the ram is perpendicular to the ram itself. Can that be confirmed too?

And if by some obscure twist of fate anyone has one in bits, any chance of a sketch of the pin & measured location of the hole in the top of the ram (which I assume is in line with the ram & at 90 degrees to it)

Thanks in advance......

Danncus · 20 February 2013, 07:16

I'm not sure what you are asking, but here are some photos from my merc 90 1998
http://opposite-locksmith.blogspot.c...orts-boat.html

uncle al · 20 February 2013, 14:32

9D280 I think the trim sender you are thing of (the round ones?) are handed port/stb but the slot and hole sizes are the same

9D280 · 21 February 2013, 08:18

Dancus, thanks, firewall isn't liking the link - will hoepfully get a look tonight.

Al, thanks for the heads up!

Mine would be on the Stbd side.

Any idea if the slot is parallel to the locating pin hole in the shaft?

uncle al · 22 February 2013, 08:32

sorry I cant remeber if the slot was parallel,

9D280 · 22 February 2013, 23:07

Danicus,

That's the one! Any chance of a pic showing the back of the top of the ram? The sender obscures the slot.

Thanks.

Danncus · 23 February 2013, 08:16

Sorry, I can't , it's 120 miles away, I'm not going back to it until April

I'll have a look Incase I have some more photos

9D280 · 24 February 2013, 10:01

That's a reasonable distance!

If you do, fab. In not don't worry. The pics have already half confirmed my suspicions.

Jeff · 24 February 2013, 12:45

Will these do ?
This is in the near fully up position
Jeff

9D280 · 25 February 2013, 18:52

Just to check- the slot is not exactly 90 degrees to the ram and that first pic isn't just a trick of the light?

Jeff · 25 February 2013, 20:47

I think if I had trimmed it fully up it would be
Jeff

9D280 · 26 February 2013, 07:51

Mind you, in the cold light of day, by that point a couple of degrees here or there isn't going to make a lot of difference to the reading on the gauge! -"up" would suffice!

How is the pin fixed to the ram? Small rivet / taper pin about midway, in line with the slot?

Jeff · 26 February 2013, 09:43

Its a 'one shot' taper pin. Its a specific part number and an absolute mare to remove the old one.
I was told the only way ( and used) was to knock the shaft out from the sender side which breaks the retaining pin.'Trilobe' If you do, I would suggest you also replace the small bushes that fit each side of the saddle ( and loctite them into the saddles as the natural movement of the up/down can make them work out and drop off) This was a warranty job on my new opti
Cheers
Jeff

Bushing ( on Opti but I think its the same for practically and V6 merc) PN 821207 2 BUSHING
Pin P/N 821539 1 PIN, Trilobe

This is useful
http://www.mercurymarine.com/parts-a.../parts-catalog

9D280 · 26 February 2013, 11:54

Yep, probably the same trilobe pin I replaced with a slight(!) mod to my lower mount for that very reason - where the trilobe holds the bottom main pin in - I through drilled & now use a HUGE split pin to hold that one in place.

Had to live with the tri-lobe up top as I'd have been thru' drilling the swivel bracket casting, and the other end would have ended up in the middle of the exhaust port! (mine is an older "pre sender" design- the big pin has a groove in the end that the tri-lobe engages in (hammered into the swiivel) to stop it falling out.

My plan is that I turn up a new top pin, drill the ram head & either grubscrew or split pin the main pin in place. Split pin preferable as it's a lot less likely to sieze.

Hence all my questions!