w108,107 Parts Hoarder
Date registered: Jun 2010
Vehicle: slc5.0cab 280sl5sp 280se4.5 500sl92 GONE:280sl79 4xW114/5 3x450sl72-3 280slc4sp81 280s69 73,81SLCs
Location: Philadelphia Area
Mentioned: 27 Post(s)
Quoted: 1573 Post(s)
So it's not a Hydrak. Correct? You've got a clutch pedal?
1) Check the clutch fluid level (brake fluid) and pump the clutch repeatedly to make sure it is working.
2) If fluid is not the problem, research whether it needs synchronizers or something else internal that I don't understand.
My experience and background (reasoning for above advice):
When I was in high school, I couldn't get my 1980 Toyota Corolla 4-speed in or out if gear some times, especially if I was trying to jam it in or out at the moment I wanted it to happen. Gently sometime it would slide in or out. What had happened was the clutch fluid (brake fluid) was leaking somewhere, and the fluid needed to commonly be topped off. The clutch was not disengaging when I pressed the pedal.
If the gears are lined up correctly, you can shift the gears on a manual transmission without disengaging the clutch. Sometimes you can shift into one gear but not others, but by lining up maybe first it reverse, it can line up other gears and then you can shift into them without issue... All with the clutch engaged. All this is easier when there is no power I force on either the transmission or driveshaft, like when the car isn't running.
When there is force on the transmission, you can imagine how a little pressure can make it harder to shift in or out of gear. Disengaging the clutch should be enough to remove any force on the transmission from the drive shaft, but that's only if your clutch is fully disengaging. Check your fluid level.
If the clutch is totally disengaging, then the movement from the driveshaft end of the transmission must be causing the problem... IF this only happens when the car is moving.
Can you shift in and out of second when the car is running but not moving?
Now why would this happen only with second gear?
I don't really know the way a shift on the column works or the internals of a manual transmission. (So you are probably wondering why I've written all this if I don't know what I'm talking about.) But it could be that the "synchro" for the specific gear is going bad. I REALLY don't understand this, and think the trans would need to come out to fix this.
I hope that helps... Or better yet, I hope someone else comes along who knows better and gives you even better advice!!
My dream car is a classic sporty five speed (stick+overdrive) convertible that seats five. If, you want 70's-80's Mercedes tuner wheels, let me know.