Welcome to Carver Yachts Owners Forum

We are a boating forum for owners of Carver Yachts to enthusiastically discuss all aspects of Carver Boat ownership. Whether you are looking for your first Carver or currently own one, you are sure to feel at home on CarverYachtOwners.com

You are currently viewing our board as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have access to searching the forum topics, post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Tach readings

GAS engine, transmission and generator repair and maintenance discussion forum.
User avatar

Topic author United States of America
Crowbar
Scurvy Dog
Scurvy Dog
Posts: 14
Joined: February 19th, 2017, 4:18 pm
Vessel Info: 1987 Carver Voyager- twin 230 hp gas
Location: LaConner, WA

Tach readings

Postby Crowbar » August 16th, 2017, 12:36 pm

305 gas engines upper helm reads 3000rpm on both engines. Lower helm reads 2000 rpm on both engines at the same time. At idle, all are the same. Lower helm tachs were replaced recently. Any ideas?

Thanks for your help. Both tachs were set for six instead of eight cylinders. On to the next fix.
Last edited by Crowbar on September 2nd, 2017, 5:55 pm, edited 1 time in total.

User avatar

Canada
bud37
Admiral
Admiral
Posts: 4676
Joined: April 23rd, 2015, 10:22 pm
Has thanked: 547 times
Been thanked: 1142 times

Re: Tach readings

Postby bud37 » August 16th, 2017, 2:03 pm

Check the back of the tachs to see they are set for right pulses for 8 cylinder.Do you know if the upper tachs are right or the lower when they get to 3000 rpm, I would see if I could check that against a tune up meter/timing light.Something that is known good.
If the boat is new to you check the setting on the back of the upper tachs as well........ :beergood:
The above is strictly my opinion always based on years of doing...remember to support local business , it pays back.
User avatar

United States of America
mjk1040
Admiral
Admiral
Posts: 1506
Joined: July 30th, 2015, 8:15 am
Vessel Info: 1998 355 AC/MY "Deja Vu"
Location: Savannah, NY
Has thanked: 9 times
Been thanked: 236 times

Re: Tach readings

Postby mjk1040 » August 16th, 2017, 8:48 pm

Interesting they are 1,000 rpm's off!
Mike :down:
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow

Canada
Viper
CYO Supporter
CYO Supporter
Posts: 5799
Joined: July 10th, 2015, 9:58 pm
Vessel Info: 1989 Carver 3807 Aft Cabin
Location: Ontario, Canada
Has thanked: 431 times
Been thanked: 1586 times

Re: Tach readings

Postby Viper » August 17th, 2017, 11:13 am

Did this just start or has it been this way since you got the boat? If it just started, find out first which station is reflecting the wrong reading. You must confirm this at the engines. Given that the lower tachs are new, one could assume that they are correct but I wouldn't rule them out completely, hence the need to confirm which reading is correct. As mentioned above, confirm that the selector switch on the back of the tachs are set properly for the number of cylinders. If they are, note the position of the switch. These switches tend to corrode internally and result in erratic/incorrect readings. Gently turn the switch back and forth several times, then return it to its original position. Don't force the switch, if it resists turning, try pushing it in slightly then turn. This is normal for some brands. This helps clean the internal contacts and may correct the readings for a short time or years, hard to say, but it depends on the condition of the switch and environmental conditions. If this doesn't correct the issue at least temporarily, then you'll need to do further diagnosis as it can be anything from a tach replacement to wiring, corroded harness plugs, poor/corroded connects, etc.

Keep us posted.

Return to “Gas Engines/Transmissions”



Who is online

Users browsing this forum: No registered users and 18 guests