DF 140 compression

[akmoosehauler]

MY 2007 DF140 with just over 30 hrs on it has from the top down
190 psi
170 psi
180 psi
210 psi
plus it was filling the oil with gas like mad. Know i know why.
I did not use syn to break it in. Right from the get go it had a hard time getting up on step. Taking about 4400 rpm to get there.
Time to call the dealer i guess. Any thought on why it did what it did?
Thanks Tom

 

[bezerk]

Re: DF 140 compression

check the low pressure fuel pump it's on the valve cover two bolt its off check if its leaking on the back side.

 

[rodbolt]

Re: DF 140 compression

I dont think its your oil
the EFI set up on the suzuki inlines is very similar to the yamaha.
have a leakdown test done, its much more accurate for checking a cylinders sealing ability. then have the dealer check the linkage adjustments, then make sure its propped to hit the top of its RPM band with your normal loat.
also check the thermostat for debris holding it open causing it to run to cold at speed.
the T-stat and overpropping an EFI motor are our leading cause of "making" oil.

 

[akmoosehauler]

Re: DF 140 compression

The dealer sent a 21 suzk pitch prop with it and it would over rev at 3/4 throttle. I then tried a 23 it would pull it would only get about 5400 rpm. The boat is a pacific skiff with a weight of about 1500 lbs all up. I have tried moving the motor up and down with no differnce. The thermostat was good so i tried a hotter one with no luck. The dealer is 400 air miles away. All linkages move freely and right amount of travel. I know not to lug a motor. I will check my hrs again. I ran a 99 saltwater 2 150 fi on and could get eally good fuel mileage out of it. It could go 36 mile round trip on 6 gallon of gas. Installed both motors myself. Thanks

 

[akmoosehauler]

Re: DF 140 compression

HI again. I was turning the motor over by hand and was hearing a clunk in the lower cyl area. Will talk to dealer tomorrow. Any other hints? Thanks Ak

 

[DadTo2Marines]

Re: DF 140 compression

I can tell you this much your cylinder pressure is unreal. My 355 with .250 dome pistons and 68cc heads only had 160psi. I would try to find out why your pressure is so high. It sounds like your cam is out of sync. It could be that your timing chain follower is having issues.

 

[akmoosehauler]

Re: DF 140 compression

The cyl pressure is 171 to 228 psi. The clunk was more in the valve are on the bottom cyl.

 

[clanton]

Re: DF 140 compression

245lbs about right for this engine, will check book tomorrow. I would first check the valve ajustment, then fuel system for water, then fuel pressure.

 

[akmoosehauler]

Re: DF 140 compression

No water in fuel system ,no tools to check fuel pressure and it is raining too much to check valves. I do have the book for it and 228 is the top for compression. The first trip out with it last year after mounting it the motor took about 4400 rpm to get on step. I put a new low pressure fuel pump on it but haven't had the chance to take it out. Dealer want me to pay shipping both ways for the motor if i send it in and i do not have the money to do that.

 

[clanton]

Re: DF 140 compression

No more the 14 lbs between cylinders, you have 121 to 228, check the valves. The clunking you hear may be the push rod for the fuel pump that you replaced.

 

[akmoosehauler]

Re: DF 140 compression

No the fuel pump was out that is why i could here the clunk real good. The compression was 170 to 210. Get a day without wind and rain i will take the valve cover off and see. Raining everyday since the 4th.

 

[rodbolt]

Re: DF 140 compression

before I started ripping parts off I would do a leakdown test, all you need is the tester and an air compressor.
that will tell you what is leaking and why.
your numbers are just to scattered.
I realize your in a remote location but engines are engines whether in downtown DC or the Arctic.
and you well realize thats simply the price you pay to live in a remote area, if you need it you have to buy it.
there is an article on the net about a home made leakdown tester that was pretty good.

 

[reeldutch]

Re: DF 140 compression

when you do a compression test on a suzuki DF 140 you should have the throthle valve wide open.

it WILL make a difference on these engines.

 

[akmoosehauler]

Re: DF 140 compression

Yes the throttle was wide open. And yes thoughs are the number for the compression test. I do have the service manual. Here we take care of motors because of no dealers or the motor lasts past the warranty.

 

[reeldutch]

Re: DF 140 compression

ok

those numbers are indeed low.
you should perform a leak down test.

you might want to decarb the motor.
after you decarb it you have to change the oil.

check the operating temperature with infrared thermometer.

those would be the first few things i would do.

hophely the decarb will clean up the engine.

i have seen motors with poor break in do the same as what you discribe.
making oil.

but i would do the maintenence first and see what hapens.

when you change the oil make real sure you know exactly the level of your dipstick.
so you can refer to it if the level changed after 5 hrs or so.

good luck

 

[akmoosehauler]

Re: DF 140 compression

No carbon in motor have run sea foam through it 2 times. The very first outing with the motor it was taking 4000-4400 rpm to get up on step. The motor was not idled for very long and all the trips were 1/2 hr or more.
Have broken in a 4 stroke 40 in and it is 8 yrs old along with other motors. I ask around for a leak down tester.

 

[reeldutch]

Re: DF 140 compression

when we prop the df 140 we would need a minimum of 5500 wot. Fully loaded boat.
the rev limiter is set at 6200.
it sounds like you are overpropped.
what is you WOT?

and how did you find out it was making oil?

 

[akmoosehauler]

Re: DF 140 compression

The dealer sent the 21 pitch with the motor after taking all the info about the boat. After the motor was broken in i tried to see where the rpm's would go. At 3/4 by the throttle handle it hit the rev limiter. The prop was not spun. I then put a 23 pitch suzuki prop on and it would only turn about 5200 to 5400 wide open. Checking the oil when i made it to my destination. On the 20hr oil change it blew out a black/blue smoke on start up and i have told the dealer everything from the start. Have also moved the motor up and down to see if that helped with rpms but no luck. Have broken in 4 other motors in and been around them for over 20 yrs.