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Old 18-04-2015, 16:14   #1
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Yanmar 1GM Shifting Issues

I am trying to resurrect a 1983 Yanmar 1gm that has been sitting for 5 years. I got her running but I cannot seem to get the sail drive to go into forward or reverse. The knob in the middle of the throttle seems frozen. Should that be pulled in or out to engage the sea drive? Also what is the best way to run the engine on the hard to insure enough water is getting to the engine?
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Old 18-04-2015, 16:32   #2
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Re: Yanmar 1GM Shifting Issues

Quote:
Originally Posted by larman View Post
I am trying to resurrect a 1983 Yanmar 1gm that has been sitting for 5 years. I got her running but I cannot seem to get the sail drive to go into forward or reverse. The knob in the middle of the throttle seems frozen. Should that be pulled in or out to engage the sea drive? Also what is the best way to run the engine on the hard to insure enough water is getting to the engine?
I haven't seen you exact setup but the ones I'm familiar with have to be pulled out to engage the gearbox lever. However if yours is frozen, it maybe frozen in the engaged position ie out. Another possibility is that the morse cable is frozen.
Both are easy enough to check, drop the cables off at the throttle/shifter end and or at the engine end. This will point you in the right direction!

As for running on the hard, the best bet is to use the bucket method. Stick a bucket near the water pump inlet and use a tube from the bucket to the water pump inlet. Then use the garden hose to keep the bucket filled. Doesn't really matter in the bucket overflows but it does matter if you let the bucket run dry!
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Old 04-12-2015, 21:01   #3
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Re: Yanmar 1GM Shifting Issues

The shifter is in to engage the transmission. If yours is like my 83 tanker 27 then it is direct drive. The shaft comes right out of the tranny to the stuffing box. Pull the center knob out to warm up the engine (1,000 rpm about).

Ken
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Old 05-12-2015, 16:43   #4
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Re: Yanmar 1GM Shifting Issues

When the Black knob is pushed IN you have normal Throttle Gear change operation. Black knob pulled out you only have Throttle response, Throttle lever MUST be in the Neutral position to pull Knob out. Copious quantities of CRC or similar after thoroughly clean around knob base to allow fluid to penetrate, gentle hammer persuasion also helps free things.
Before starting on Throttle controls disconnect cable at Sea Drive and check for free movement. If you are not sure if Knob is stuck IN or Out have someone watch throttle at engine for movement as described above.
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