Flybridge3440
Cadet
- Joined
- Apr 30, 2010
- Messages
- 6
I have to share the woes that I have had over the last two weeks working on a friends recently purchased Glastron. It may be a bit winded but it may help someone to diagnose a future problem.
My friend purchased the boat knowing that it had sat for five years and had a problem of some sort when it was last taken out of the water. The engine was not fogged before storage but i'm not sure if even fogging would have helped after that period of time.
When he tried to start the boat, the timing belt snapped in half and broke the distributor cap in the process. We ordered all new parts to include dist.cap, rotor, points & condenser, timing belt (of course), plugs, wires, intake & exhaust gaskets and head gasket.
We tore down all of the needed items to get down to business. Removed the head and found that several of the lifters were stuck as well as the valves. The cylinders and pistons all looked good from what we could tell by rotating the crank. After we removed all of the valves and lifters we cleaned them up, cleaned out the guides and hand lapped the valves.
After getting everything back together up to the timing belt, we lined all of the timing marks up and it all matched up perfect to the belt and then set the distributor. We then did a compression check only to find that we were getting @ 20 lbs of compression in all cylinders.
Well, we decided to put a little MMO in each plug hole, give it a spin and let it sit over night. We proceeded the next night to recheck the compression. Same deal.......20#'s! So we put some 30 weight in the plug holes and let her sit over night.
Next night........same thing! 20#'s! Are you kidding me? So we decided to do a little searching on the net and he found a boating site where someone had found that his cam timing mark was off. He also found a couple of pics that showed how the cam lobes should look after they lined up. So.....we set the engine up this way and tried it out. Nope! NA,DA! No dice! still no compression!
After pondering and loosing another nights sleep to rack my brain and try and figure this thing out I just decided to go back to the basics. After thinking about how a four stroke engine works, I decided to set up the marks on the crank then turn the cam with a socket until the intake lobe was just about to open and the exhaust valve had just closed. I then installed the timing belt, tightened the tensioner, rotated the crank 360*, pulled the distributor out and set the rotor to the #1 spot, set the valve cover in place and turned the key. Well.......guess what? She fired right up with a shot of starting fluid on five year old gas.
It turned out that the timing mark on the cam was off @ 60*. I guess the moral of the story is that even in Switzerland than build engine on Monday and Friday just like we do here in the good ole U.S.A.
My friend purchased the boat knowing that it had sat for five years and had a problem of some sort when it was last taken out of the water. The engine was not fogged before storage but i'm not sure if even fogging would have helped after that period of time.
When he tried to start the boat, the timing belt snapped in half and broke the distributor cap in the process. We ordered all new parts to include dist.cap, rotor, points & condenser, timing belt (of course), plugs, wires, intake & exhaust gaskets and head gasket.
We tore down all of the needed items to get down to business. Removed the head and found that several of the lifters were stuck as well as the valves. The cylinders and pistons all looked good from what we could tell by rotating the crank. After we removed all of the valves and lifters we cleaned them up, cleaned out the guides and hand lapped the valves.
After getting everything back together up to the timing belt, we lined all of the timing marks up and it all matched up perfect to the belt and then set the distributor. We then did a compression check only to find that we were getting @ 20 lbs of compression in all cylinders.
Well, we decided to put a little MMO in each plug hole, give it a spin and let it sit over night. We proceeded the next night to recheck the compression. Same deal.......20#'s!
So we put some 30 weight in the plug holes and let her sit over night.Next night........same thing! 20#'s! Are you kidding me?
So we decided to do a little searching on the net and he found a boating site where someone had found that his cam timing mark was off. He also found a couple of pics that showed how the cam lobes should look after they lined up. So.....we set the engine up this way and tried it out. Nope! NA,DA! No dice! still no compression!After pondering and loosing another nights sleep to rack my brain and try and figure this thing out I just decided to go back to the basics. After thinking about how a four stroke engine works, I decided to set up the marks on the crank then turn the cam with a socket until the intake lobe was just about to open and the exhaust valve had just closed. I then installed the timing belt, tightened the tensioner, rotated the crank 360*, pulled the distributor out and set the rotor to the #1 spot, set the valve cover in place and turned the key. Well.......guess what? She fired right up with a shot of starting fluid on five year old gas.
It turned out that the timing mark on the cam was off @ 60*. I guess the moral of the story is that even in Switzerland than build engine on Monday and Friday just like we do here in the good ole U.S.A.
