90's Mercury 135 Help

[Crezzlin]

I'm after any info on this model, all I can tell is it's a 135hp V6! I'm wanting to service or just check the motor over as its done very little time since serviced when I got it..

Ok I've used it about 5 times now with no problems, I used some different oil from what was in the tank, I've been told it was quicksilver, but I can't remember what the new stuff was, but since then the motor can be hard to start and tends to smoke more on start up, prob been choked etc but could this be the new oil.

I'm going to replace the oil and plugs this week, can anyone tell me what kind of pressure I should be getting from the cylinders as I will check this at the same time, apart from that any info or possible yr the motor is from the photo would be handy, as I have no idea.. Sorry to go on :

Thanks

[9D280]

No pic so If my guess of an oil injecting 2- stroke is wrong, apologies.

Any TCW3 2- stroke oil should work in there. There are if you search a few threads about the relative merits ov various brands of oil, but the bottom line is they should al ldo the job and be mixable. (I had to mix brands a couple of times in the past when I for example had Yamlube in the tank and when about to run out could only source the quicksilver stuff).

You might be amazed at the difference new plugs can make.

Can't help on the compression absolutes for that engine, sorry.

[Boats&Outboards]

Your looking for anything between around 110psi-135psi dependant on age, usage etc.

It's more important that they are within tolerance of each other though so when you take the test you want them to be within 10% of each other.

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

[Crezzlin]

Thanks Guys, will report back tomo.. fingers crossed

[AK2AZ]

IIRC it should be an inline 4 cylinder like my 115 of the same year (1991). 2 carbs are the idle circuit and the other 2 kick in around 1,800 rpm. Any TCW3 oil will work and a fresh set of plugs may just fix it for you. Hot re-starts will ghet you a bit of smoke. Otherwise, try to Seafoam it and see if it cleans up the idle a bit. Mine gets finicky with a bit of water in the fuel.

[Boats&Outboards]

The 135 is a V6.

Those 4 cyl ones are right pigs! They are very heavy on fuel, rough idle, not great for manoeuvring etc (as they power up when you hit 2000 rpm which can give you a bit of a shock if your not expecting it

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

[Turbodiesel]

2nd that!!

[Crezzlin]

Hi guys, yeah its a v6, i only managed to try it over the weekend, OK i was only getting 25-35psi per cylinder :s i changed the plugs and she starts no problem, i even did a 22mile trip up the coast none stop at 5,000rpm doing 45-47 mph all the way in perfect conditions, after the big run i stopped it and restarted no problem, on the way back i stopped and started it again after 15min wait for slip, after this time it was a little bit of a pain to start after 10 secs or so she started with a puff of smoke but ran OK.. I'm thinning the compression tester is faulty or can all 6 cylinders be this low and still run? thanks will need to try a different one soon..

[Nos4r2]

Tester's faulty. It probably wouldn't even fire at 35psi.

[Crezzlin]

Originally Posted by Nos4r2

Tester's faulty. It probably wouldn't even fire at 35psi.

Cheers will try again with different fittings tomo.