1.9DG Engine problem

[Superfly]

Hi,

The thing is I have found the air filter and the breather that goes to the top of the carb to be damp, so something is a miss. It also stinks of unspent fuel from the exhaust, and only runs on three or so on cold mornings, the colder it is the worse it runs. So I have done the following:-
plugs changed
Dizzy cap and rotor arm changed (rev limited)
timing set
mixture set leaner
Air filter changed again! (These air filters are very expensive ((Fram ca4966)) and this one has only been in since Aug 08!

Not sure if this is connected to the fault but, the dipstick is really hard to pull out, as if it's been sucked in?

My theory:- has the air filter got wet down the vent, thus restricting the air flow to the engine, causing it to try and breath in from the breather and dip tube?? Just a thought?? Possibly sucking vapour up the breather?

It doesnt use any water at all, but does use a small amount of oil but always has done, not a worry tbh.

Tappety at the moment but intermittent, sometimes its quiet. Is it possible to get petrol in the oil, when overfueling? Thinning the oil out, could cause it to be tappety?

Any help would be greatly appreciated,

rgd's

Simon

[ricicles]

is it wet with fuel or oil? do you think you have over filled the oil or fuel? i think the mixure on your carb will only adjust the mixture for tickover from there on the jets take over. might be wrong though. does your oil warning light come on? does your engine smoke?

[Superfly]

It's wet with a watery, slightly petrolly mix mainly clear but a minimal amount of black discolouration, if i take the filter out it does dry off. (Presumed combustion by-product vapours?)

Oil never been overfilled and water spot on and never needs topping up.
Oil light did come on once with an audiable buzzer, but that was a geniune low oil situation made worse by a sharp bend on a slip road, i stopped immediately and topped the oil up, the level was still visible on the dipstick so had'nt ran m/t - this was around 8 months ago though.

Engine temp is perfect and never gets hot, gauge sits at half way.

Fuel has been overfuelling on cold start and running rich when warm.

I have only ever seen it smoke once last year on the M6 heading for Silverstone, it smoked in overrun when i let off, and only a kwik blast, nothing since. Where I park it there is a black patch against the wall, from starting up.

Could there be any more breathers that need clearing?

Praying its not curtains for this engine.
cheer's
Simon

[Superfly]

C'mon peps, yr help is required ASAP,


Si

[Grun]

C'mon peps, yr help is required ASAP,


Si

Dunno Si,
Got a DJ .....Choke....Choke valve setting would give you some of your symptoms.

Mike.

[ghost123uk]

You've first GOT to find out what is wetting the air filter.

An engine with a wet air filter will run VERY rich.

Suggest you dry the filter thoroughly, then temporarily take off the breather hose from the air filter casing and put it into the neck of a plastic bottle, run around for a day or so and look see, when the engine is running what comes out of the breather pipe (like smoke / vapours etc) and if anything much finds it's way into the plastic bottle.

Then examine the air filter, is it wet again ? - if so figure out how as it can only get wet then from summat coming in from the air inlet pipe that goes in the r/h cubby compartment. = water ??

My theory:- has the air filter got wet down the vent, thus restricting the air flow to the engine, causing it to try and breath in from the breather and dip tube?? Just a thought?? Possibly sucking vapour up the breather?

No can't happen, the breather blows gasses out, not sucks, the engines insides are either at atmospheric pressure or above so breathers and dipsticks etc blow, not suck.

Tappety at the moment but intermittent, sometimes its quiet. Is it possible to get petrol in the oil, when overfueling? Thinning the oil out, could cause it to be tappety?

Yes and it's bad for the engine as it damages the oil.

Check your choke flap is open when the engine is warmed up. (you could jam it open for testing, won't do any harm)

What do your plugs look like after a run ? (post back if you need to know what they should look like)

[Superfly]

Cheers Mike.

John,

the plugs are exactly like they should be in the Haynes Manual and on this internet site, click link

http://www.verrill.com/moto/sellingguid ... rchart.htm" onclick="window.open(this.href);return false;

thankyou

Simon

[Superfly]

Bump!

for any more assistance,

please

Simon

[ghost123uk]

It's (the air filter) wet with a watery, slightly petrolly mix mainly clear but a minimal amount of black discolouration, if i take the filter out it does dry off. (Presumed combustion by-product vapours?)

You've first GOT to find out what is wetting the air filter.

An engine with a wet air filter will run VERY rich.

Suggest you dry the filter thoroughly, then temporarily take off the breather hose from the air filter casing and put it into the neck of a plastic bottle, run around for a day or so and look see, when the engine is running what comes out of the breather pipe (like smoke / vapours etc) and if anything much finds it's way into the plastic bottle.

Then examine the air filter, is it wet again ? - if so figure out how as it can only get wet then from summat coming in from the air inlet pipe that goes in the r/h cubby compartment. = water ??

It sounds like your engine is running very rich due to a wet air filter.
This is bad for the engine (the extra fuel washes the protective layer of oil off the bores and rings).
Mind you, you do say the plugs look correct so it might not be that at all !!

Simon, I certainly don't want to sound rude, but unless you can do a bit of checking up on things yourself, you are going to have to find a T25 experienced mechanic and pay them to have a look.

[Superfly]

Cheers Ghost,

will try the breather in the bottle test this week, and post any findings.

I have just noticed a pipe off, it's the thin straw like pipe that comes off the top of the air filter, theres two in total but ones connected to the carb area, should this one be connected or vented to atmosphere?

thanks again, and does anybody know a T25 mechanic, I am in South Manchester but could travel.

PS - Ghost I have in laws in Guilden Sutton, not too far from you I believe,

Simon

[clartsonly]

I have a DF but in my opinion
1) dont worry so much about the occasional tapping, a long run should resolve that.
2) clean out engine breather, and make sure the pipe has not collapsed, I have problems when mine first starts if I unplug the breather hose from the inlet conduit, white emulsified goo spits out, this is then going back through the carb and making it struggle until it has run for about 5 miles stalling at junctions etc, back firing a bit. somehow when it is cold it has built up condensation somewhere and is pushing that out of the oil breather. cleaning the breather and hose regularly helps.. but apart from that it seems to always happen. It will also run down to the filter, when this pipe gets particualrly blocked overtime oil vapours condense and run down to the airfilter too.
3) are you sure it is not simply struggling so you think it is running on 3 cyclinders, otherwise check the leads, swap them out with some others to test.

[Superfly]

thanks CO

Yr right the tapping does usually go after around 8 miles or so. The symptons you get are virtually the same as mine infact it could be mine yr talking about barring the emulsified oil from the breather, i get a little watery like smelly stuff coming out, but its not dead thick.
I am sure it's not an electrical fault.
Touch wood it is running brill at the moment, after cleaning the pipe out, having the timing done and the carb tweaked, oh plus a new air filter at 17 english squids.

thanks again yall

SImon