I picked up an '08 Navi Comfort with 37k a couple weeks ago. Started it and let it idle while I unloaded it from my truck and let it idle in my driveway while I put the tie downs and ramp away. After about 25 min I noticed it had started shooting coolant out of the overflow hose. I quickly shut it off and heard the coolant bubbling in the engine. Temp gauge was in the red but the fans were not running. Let it cool down, refilled the radiator and overflow bottle.
While doing a couple warm up/cool down cycles to get any air out I began looking for the problem. I jumped the high voltage side of the fan relay and both fans work perfectly. Also, relay is good. Problem is no 12+v on the hot wire of the relay trigger circuit. Turns out it had only been driven 60 miles in the last 15 months, had been stored in a barn, and had become home to a family of hard working mice. Most of their debris was in the airbox (pic coming if I can figure out how) which I found and cleaned out when I replaced the air filter. I can also see some debris above the left side cylinders, under what I assume are the intake throats. Haven't had the front fairing off to verify yet. I assume they chewed the 12+v wire that comes up from C11. In any case, over the next couple weeks I put about 500 trouble-free miles on and all seemed good.
I mention all this as some history for my current problem. Last week I did a valve check, found all valves on the tight end of the acceptable range with the #6 intake just a bit too tight. I pulled the left side cam, swapped a few shims, replaced a couple to bring all valves back to the middle of the range. While doing so I had trouble pulling the bucket off the #6 intake. It felt like there was a bit of a lip or tight spot that kept the bucket from sliding out of the bore. Wasn't glad to see that but in the end I figured it had gone 37k that way so it must be OK. I buttoned it back up and put another hundred or so trouble-free miles on it.
This morning I decided to do a compression test. Pulled the plugs and got started. The first couple readings went fine. Then, while spinning the engine for the next reading, I thought I heard a 'rap' sound. Wasn't sure I really heard something so I continued on. A bit later I heard it again, but decided it must have been something falling on the floor so I continued. Finally, while rechecking a reading on the left side I heard it again and it sounded like it came from the area of that #6 cylinder so I stopped. The only thing I can think it might be is that valve bucket sticking open a bit and then releasing and slapping up against the cam.
Any thoughts? Should I take the cam back out and take a look? Maybe switch a different bucket in there and see if it also seems tight? All thoughts welcomed!
While doing a couple warm up/cool down cycles to get any air out I began looking for the problem. I jumped the high voltage side of the fan relay and both fans work perfectly. Also, relay is good. Problem is no 12+v on the hot wire of the relay trigger circuit. Turns out it had only been driven 60 miles in the last 15 months, had been stored in a barn, and had become home to a family of hard working mice. Most of their debris was in the airbox (pic coming if I can figure out how) which I found and cleaned out when I replaced the air filter. I can also see some debris above the left side cylinders, under what I assume are the intake throats. Haven't had the front fairing off to verify yet. I assume they chewed the 12+v wire that comes up from C11. In any case, over the next couple weeks I put about 500 trouble-free miles on and all seemed good.
I mention all this as some history for my current problem. Last week I did a valve check, found all valves on the tight end of the acceptable range with the #6 intake just a bit too tight. I pulled the left side cam, swapped a few shims, replaced a couple to bring all valves back to the middle of the range. While doing so I had trouble pulling the bucket off the #6 intake. It felt like there was a bit of a lip or tight spot that kept the bucket from sliding out of the bore. Wasn't glad to see that but in the end I figured it had gone 37k that way so it must be OK. I buttoned it back up and put another hundred or so trouble-free miles on it.
This morning I decided to do a compression test. Pulled the plugs and got started. The first couple readings went fine. Then, while spinning the engine for the next reading, I thought I heard a 'rap' sound. Wasn't sure I really heard something so I continued on. A bit later I heard it again, but decided it must have been something falling on the floor so I continued. Finally, while rechecking a reading on the left side I heard it again and it sounded like it came from the area of that #6 cylinder so I stopped. The only thing I can think it might be is that valve bucket sticking open a bit and then releasing and slapping up against the cam.
Any thoughts? Should I take the cam back out and take a look? Maybe switch a different bucket in there and see if it also seems tight? All thoughts welcomed!