Mercury trim tilt

[sam am I]

Re: Mercury trim tilt

Well I'm still a tad suspect.......

Even if a section of the bolt(MRV) broke off with one or two o-rings still attached due to water or whatever(albeit making it tough to get the broke part out of the hole and/or not function as per manually allowing it to drop when backing the valve out)

The valve bolt was still in place, the o-rings should have still been held in place in their respective outer seats as they were still in their inner seats on the nylon bolt? The broke tip didn't go floating forwards into the works, it was still in place as well it sounds. Oil shouldn't have been able to cross into adjacent channels.

Perhaps the nylon fractures in such a way to allow the oil to leak through the fractures or it's breaking right at/in the o-rings inner seat....hmmm, certainly possible I reckon.


GL

 

[Drewcdf]

Re: Mercury trim tilt

So after getting the broken tip of the MRV out of the base, I assembled everything back together (without replacing any o rings) I just wanted to see if it would work with the tip not plugging the hole. Nothing worked. Same results as before. (Yes I filled the trim fluid back up and bled the air) I put the MRV back in without the broken tip (so it had 2 o rings still)

I thought that it might still work. But maybe it needs the tip of the MRV and the 3rd o ring to have trim go up or down. (I'm just not familiar with where the fluid goes with all the little holes this thing has).

 

[sam am I]

Re: Mercury trim tilt

Yeah, the o-rings and position "program" the oil to follow certain paths when in place, when not in place, it allows the oil to back flow.......as far as I can observe anyway

I slid a small'ish diameter punch down the bore w/o the MRV in place and oil came out that hole @ 1:30 in photo B (there are three in a diagonal row @ 1:30 pictured, including the threaded bolt hole at upper right, it's the middle of the three hole's the oil came out) while testing the depth of the hole to see if a broke tip could move away further deeper into the bore.

It can!! The bore is differently deeper(by about 1/4" on mine anyway) than the length of the MRV bolt. The bore is such that that where the o-ring sits normally, it's just big enough for the o-ring to seat snuggle of course but, a bit of a tapper in the diameter moving backwards toward the second o-ring, appears as if it would stop the broken tip from moving/getting too deeply into the bore and bottoming out. Of course if it break under the o-ring, all bets are off.

My guess, if it relates to the broke tip in addition with your test.......The pressure that is required to form between the second and third(the broke off tip) o-ring's is perhaps able to push the broke off tip with its' o-ring JUST far enough down into the bore past a programming port that the oil is able to back flow perhaps out the hole I saw it come out.

So IF this is the case and in theory........to test this was in fact happening and if it is in fact happening, wanted to prevent this movement from perhaps happening in the event of it breaking again in the future, a guy could drop/place a precise cut length piece of small'ish diameter stock aluminium down into the bore to where one side laid/rested against the bottom of the bore and where the other side, where when the MRV bolt is threaded in, it would JUST push back on the tip thus, keeping a small amount back pressure on the tip and/or keep a broke off tip from migrating inwards down the bore(obviously it can't go backwards)

The stock would need to have a small enough diameter to allow oil to move around it at some level though but larger enough(or shaped such that) that the tip would press up against it.. It would still manual down too if it weren't broke off BUT, it would(should, un-tested) work properly if the tip were broke off.

I cheap though.....BUT, if water has got in and did this?, the MRV is just the effect according to RRitt, 2 of 3 cases anyway. You best be fix'n some seals I suspect else you'll be do'n this again eh? Is the oil milky?

I'm going to go hit the slots now.........I put mine back together and bled it in maybe 6 cycles up and down, works wonderfully.

 

[rvrlaxn]

Re: Mercury trim tilt

You did say that your manual release valve had 2 o rings on it correct. did it end with a flat or rounded tip. I just had this same problem and guess what. The valve should have 3 orings on it, with a rounded tip. The tip was broken off inside the pump with the 3rd oring partially blocking a port. I fished it out, have the new bypass valve in hand and intend to put it in and try it tonight. I will let you know how it goes, but to me that is a smoking gun and expect no problems.

Steve

Sorry all. I got so excited that I figured out my problem that I was eager to post, and did not read all of the responses.