Hello,
I´m new to this forum and I serched the forum for any similar problem but I havent found any so I try to explain my problem and hope that someone has the answer.
I have a Stingray 190 cs 2002 with a Mercruiser 3.0 and Alpha One gen 2 drive.
2 years ago I hit a underwater cay and had to replace the lower unit. The rest of that season was dedicated to break in the new lower unit and the last season I didnt have much time to ride the boat but I thought that it had lost top speed.
So when I put the boat in the water this season I was determined to find out why I lost speed. As I began to search for the fault I noticed that the tachometer was behaving strange, it showed to high rpm. I solved that problem by turning the screw on the backside a couple of times and then it worked just fine. But now I realized that I lost 900 rpm at wot.
The boat runs fine at idle and up to 3900 rpm and there it stops. It should reach 4800 rpm as it did before the cay hit but no.
At first I did not connect the problem with the cay hit so I started with a look at the plugs and they looked like brand new. My first thought, the engine is running way to lean!
But it consumes more fuel than before...
This is what I have done so far,
Checked ignition timing, OK
Changed distributor cap and rotor
Rebuilt carburator
Checked fuelfilter in fueltank, fuelpump and carburator, OK
Checked fuelpressure, OK
Checked ratio on the new lower unit, it is 2.0:1 as it should be.
Checked ratio on the whole sterndrive and it is 2.0:1 as it should be.
Opened the powerjet in the carb so it was wide open all the time but no difference to the engine.
Checked the sparkplugs at idle and running at 2500 rpm and just shut down the engine, they look brand new at any rpm. Engine running lean all the time??
Now to my question,
When I started the boat after I hit the cay it was in reverse gear. The hit had made a 2 inch impact wound right on the shift spool and slamed in the reverse gear so the engine stalled.
Is it possible that the brutal stop, from 3000 rpm to 0 rpm, could have made the crankshaft gear or the camshaft gear to have been turned on either axel and therfore changed the igniton timing so it now is to late? The spark doesnt come until the piston is on its way down and that is causing loss of torque, high fuelconsumption and a high combustion temp?
Or if anyone have any other ideas?
Thank you
snapphane
I´m new to this forum and I serched the forum for any similar problem but I havent found any so I try to explain my problem and hope that someone has the answer.
I have a Stingray 190 cs 2002 with a Mercruiser 3.0 and Alpha One gen 2 drive.
2 years ago I hit a underwater cay and had to replace the lower unit. The rest of that season was dedicated to break in the new lower unit and the last season I didnt have much time to ride the boat but I thought that it had lost top speed.
So when I put the boat in the water this season I was determined to find out why I lost speed. As I began to search for the fault I noticed that the tachometer was behaving strange, it showed to high rpm. I solved that problem by turning the screw on the backside a couple of times and then it worked just fine. But now I realized that I lost 900 rpm at wot.
The boat runs fine at idle and up to 3900 rpm and there it stops. It should reach 4800 rpm as it did before the cay hit but no.
At first I did not connect the problem with the cay hit so I started with a look at the plugs and they looked like brand new. My first thought, the engine is running way to lean!
But it consumes more fuel than before...
This is what I have done so far,
Checked ignition timing, OK
Changed distributor cap and rotor
Rebuilt carburator
Checked fuelfilter in fueltank, fuelpump and carburator, OK
Checked fuelpressure, OK
Checked ratio on the new lower unit, it is 2.0:1 as it should be.
Checked ratio on the whole sterndrive and it is 2.0:1 as it should be.
Opened the powerjet in the carb so it was wide open all the time but no difference to the engine.
Checked the sparkplugs at idle and running at 2500 rpm and just shut down the engine, they look brand new at any rpm. Engine running lean all the time??
Now to my question,
When I started the boat after I hit the cay it was in reverse gear. The hit had made a 2 inch impact wound right on the shift spool and slamed in the reverse gear so the engine stalled.
Is it possible that the brutal stop, from 3000 rpm to 0 rpm, could have made the crankshaft gear or the camshaft gear to have been turned on either axel and therfore changed the igniton timing so it now is to late? The spark doesnt come until the piston is on its way down and that is causing loss of torque, high fuelconsumption and a high combustion temp?
Or if anyone have any other ideas?
Thank you
snapphane
