huggyb1972
Petty Officer 1st Class
- Joined
- Apr 1, 2013
- Messages
- 237
Ahoy there,
I finally found the issue with the trim system on my SP/280 hybrid drive. Since getting it splashed and sorting all the problems out of the rig mostly fuel related. I finally delved into why trim wouldn't hold position.
I didn't have any leaks externally I took the fittings off the pump and rigged a air hose setup with a gauge on it to look for blowby. That all came back with good results which pointed to the valve portion.
In the pump there's a set of directional check valves which are a major pain to remove. Inside those there is a like a little spool with a spring that is used to lock the drives position. On the end of that little spool piece there is supposed to be a o-ring mine didn't have one in one side of it. The other side did have what was left of the o-ring. To get the check apart I was able to use my drill to grab the small end and lock the big end in my smooth jaw vise and spin it out. The little o-ring was a 1.5mm idx3.5mm id. The drive has been in trailer position since Monday and is still on the rubber bumper, normally it would've drifted down in 20 minutes.
I finally found the issue with the trim system on my SP/280 hybrid drive. Since getting it splashed and sorting all the problems out of the rig mostly fuel related. I finally delved into why trim wouldn't hold position.
I didn't have any leaks externally I took the fittings off the pump and rigged a air hose setup with a gauge on it to look for blowby. That all came back with good results which pointed to the valve portion.
In the pump there's a set of directional check valves which are a major pain to remove. Inside those there is a like a little spool with a spring that is used to lock the drives position. On the end of that little spool piece there is supposed to be a o-ring mine didn't have one in one side of it. The other side did have what was left of the o-ring. To get the check apart I was able to use my drill to grab the small end and lock the big end in my smooth jaw vise and spin it out. The little o-ring was a 1.5mm idx3.5mm id. The drive has been in trailer position since Monday and is still on the rubber bumper, normally it would've drifted down in 20 minutes.
