V6 Looper high RPM problems.... - Moderated Discussion Areas

  ContinuousWave
  Whaler
  Moderated Discussion Areas
  ContinuousWave: Whaler Repairs/Mods
  V6 Looper high RPM problems....

search | FAQ | profile | register | author help

Author Topic:   V6 Looper high RPM problems....

peteinsf posted 05-23-2003 02:06 PM ET (US)
The Challenger's port 200HP has a strange problem and since all of the parts are expensive I thought I would bounce it around here first...
Above 3K RPM the tach start jumping around, by 4K it goes from 0 to full scale pounding the stops. The motor idles OK and run smooth all the way to 4500 -> 5000. The starboard motor will go above 5K fine.
Any ideas where to start (I was hoping not to buy more then one major part. My guess would all of or one of the following; stator, powerpack and maybe a flywheel?
Pete
(1995 Evinrude 200-STL)

JBCornwell posted 05-23-2003 07:12 PM ET (US)
Hi, Pete.
What is the engine doing while the tach is going crazy? If it is running well and responding to the throttle you either have a bad tach or a bad signal going to it.
Switch the leads between the tachs. If the same tach still jumps around it is the tach, if the other one now jumps around it is in the engine where the tach signal is generated. I don't have a manual on your engine, but I suspect that the signal comes from the stator.
If the engine is acting like the tach, I would also look at the stator.
Good luck.
Red sky at night. . .
JB
jimh posted 05-23-2003 07:21 PM ET (US)
If the tachometer guage is one of those with a selector switch on the back for matching it to the number of poles in the alternator, I would suggest operating the switch a few times, going back and forth between the desired selection and adjacent selections. This may help.
JB's suggestion to swap out the connections with the other Tachometer guage is a good one, too. That should help isolate where the problem is located.
Sal DiMercurio posted 05-23-2003 07:26 PM ET (US)
It's either the tach, or rectifier.
Do you notice the battery on that engine not being as hot as it should ?
If so, it's the rectifier.
Do as JB says by switching the tach wires with the other engine & if that particular tach is smooth & the other now acting up, time for a new rectifier on the crazy tach engine.
To find the rectifier, just follow the gray wire from the tach , to the rectifier, [ gray wire is always the tach wire ].
If that engine has the 9 amp charging system, the rectifier will cost $65.00, if you have the larger charging system, it's gonna cost you about $280.00.
Sal
peteinsf posted 05-23-2003 11:20 PM ET (US)
JB, Jimh,
The motor runs smooth but it tops out on power when the tach is jumping. The motor with the good tach gets 750-1K higher WOT rpm.
I swapped the tachs between the motors (before I noticed the power loss) and it follows the motor. I also checked all the connections back to the rectifier black box.
Sal,
Is there a way to tell if it's the rectifier vs the stator?
Pete
Sal DiMercurio posted 05-23-2003 11:39 PM ET (US)
To check the rectifier start the engine & dissconnect the gray tach wire from the back of the tach, check that wire to see if it's getting a full 12 volts from the rec., if it isn't, the rec is bad.
I don't understand what you meant be the engine tops out when the tach is jumping.
Do you mean it goes to wot ?, or runs rough ?
If it runs rough it could be your stator.
Sal
peteinsf posted 05-24-2003 12:04 AM ET (US)
Sal,
Not rough, smooth but less power (lower RPM at WOT) then the other motor...
Pete

Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.

Author	Topic: V6 Looper high RPM problems....
peteinsf	posted 05-23-2003 02:06 PM ET (US) The Challenger's port 200HP has a strange problem and since all of the parts are expensive I thought I would bounce it around here first... Above 3K RPM the tach start jumping around, by 4K it goes from 0 to full scale pounding the stops. The motor idles OK and run smooth all the way to 4500 -> 5000. The starboard motor will go above 5K fine. Any ideas where to start (I was hoping not to buy more then one major part. My guess would all of or one of the following; stator, powerpack and maybe a flywheel? Pete (1995 Evinrude 200-STL)
JBCornwell	posted 05-23-2003 07:12 PM ET (US) Hi, Pete. What is the engine doing while the tach is going crazy? If it is running well and responding to the throttle you either have a bad tach or a bad signal going to it. Switch the leads between the tachs. If the same tach still jumps around it is the tach, if the other one now jumps around it is in the engine where the tach signal is generated. I don't have a manual on your engine, but I suspect that the signal comes from the stator. If the engine is acting like the tach, I would also look at the stator. Good luck. Red sky at night. . . JB
jimh	posted 05-23-2003 07:21 PM ET (US) If the tachometer guage is one of those with a selector switch on the back for matching it to the number of poles in the alternator, I would suggest operating the switch a few times, going back and forth between the desired selection and adjacent selections. This may help. JB's suggestion to swap out the connections with the other Tachometer guage is a good one, too. That should help isolate where the problem is located.
Sal DiMercurio	posted 05-23-2003 07:26 PM ET (US) It's either the tach, or rectifier. Do you notice the battery on that engine not being as hot as it should ? If so, it's the rectifier. Do as JB says by switching the tach wires with the other engine & if that particular tach is smooth & the other now acting up, time for a new rectifier on the crazy tach engine. To find the rectifier, just follow the gray wire from the tach , to the rectifier, [ gray wire is always the tach wire ]. If that engine has the 9 amp charging system, the rectifier will cost $65.00, if you have the larger charging system, it's gonna cost you about $280.00. Sal
peteinsf	posted 05-23-2003 11:20 PM ET (US) JB, Jimh, The motor runs smooth but it tops out on power when the tach is jumping. The motor with the good tach gets 750-1K higher WOT rpm. I swapped the tachs between the motors (before I noticed the power loss) and it follows the motor. I also checked all the connections back to the rectifier black box. Sal, Is there a way to tell if it's the rectifier vs the stator? Pete
Sal DiMercurio	posted 05-23-2003 11:39 PM ET (US) To check the rectifier start the engine & dissconnect the gray tach wire from the back of the tach, check that wire to see if it's getting a full 12 volts from the rec., if it isn't, the rec is bad. I don't understand what you meant be the engine tops out when the tach is jumping. Do you mean it goes to wot ?, or runs rough ? If it runs rough it could be your stator. Sal
peteinsf	posted 05-24-2003 12:04 AM ET (US) Sal, Not rough, smooth but less power (lower RPM at WOT) then the other motor... Pete