danknug
03.05.2021 23:36:10
Re: 1988 Merc 115hp dies once put in gear
See full version: 1988 Merc 115hp dies once put in gear
Re: 1988 Merc 115hp dies once put in gear
Re: 1988 Merc 115hp dies once put in gear here
reversed the stator leads going to the switchboxes. The problem of no spark traveled to the odd cylinders. Ordered a new stator today
Verado Powerhead. Our big takeaway from our study of the Mercury 115-hp four-stroke is the bulletproof nature of its powerhead. Clearly, this is an engine that should go on ticking for a long, long time due to the fact that it is overbuilt for both its horsepower and applications. It also used numerous components from the Verado series.
WOT & Best Cruise. Top speed of these boats was 41 mph and the slowest was 33 mph. Best cruise speeds all came in the low 20s and fuel economy ranged from 5.5 mpg to 6.4 mpg.
More and more small sportboats are being offered in outboard configurations, and although we have only conducted a few tests in this type, we see some consistency of some data points. These boats tend to be from 16' to 20' (4.87 m to 6.09 m), made of fiberglass, and weigh from 1,500 lbs. to 2,100 lbs. (681.8 kgs. to 954.5 kgs.) The beam of 16' boats is around 7' going up to about 8' for 20-footers. We saw deadrise angles at the transom ranging from 15-degrees to 19-degrees.
Maintenance-Free Valve Train. Virtually all four-stroke engines need their valve lash adjusted after so many hours of operation. This is a costly service call that is mandatory and it is eliminated on the Mercury 115.
Typically these boats are aluminum, but there were a few fiberglass boats tested as well. The boats we studied ranged from 17' to 20' and from 1,300 lbs. to 1,800 lbs. The beams were all about the same, around 7'10". Here we saw some definite trends and all three make sense: here
WOT & Best Cruise. WOT speeds ranged from 37 mph (14" pitch prop) to the low 40s (19" prop and 14-degree deadrise). The most efficient cruising speeds generally clustered from 18 to 28 mph. Here we saw miles per gallon numbers, ranging from 5.4 gph (the heaviest boat) to 7.5 gph (the lightest boat). here
Other option is your shift linkage in the engine could be damaged. If not turning the prop shaft your problem is in your prop to prop shaft interface. hub damaged, splines not connected.
Any help/ideas is much appreciated.
If you can turn the flywheel in both positions with the prop your LU shift mechanism should be ok. assuming the prop you are grasping can turn the prop shaft. If you can't the clutch dog located on the prop shaft may be stripped. It slides back and forth with the shift lever, purpose to engage the rear of F gear (sawtoothed ratcheting gearing), assume a central position contacting neither for N, or the front of the R gear's Cogs and Slots. vertical sided, have to be perfectly aligned to mesh.
Some background info so this all happened after I got a spun hub. I was out in the water and shifted into reverse and it seems that the prop nut came loose and resulted in a spun hub. Replaced the hub and then realized the issue with the reverse. here
The reverse issue was developed when the prop hub spun. With a spun prop hub I still had minimal power. Manage to make it back to the dock on forward gear real slow. During this trip with the hub damaged but not fully destroyed i also shifted to reverse when i was docking and noticed that it was not engaging at all and making a funny noise. Since the hub was damaged i thought that was the reason reverse was not working. here
Just for grins, disconnect the remote shift linkage. Engine OFF, vertical, slowly shift the engine into reverse till you fill the shifting mechanism in your hand resist your pushing. with light pressure. Mark the position of the shift mechanism vs position in neutral. Slowly rotate the prop in the reverse direction while continuing to apply light pressure. Can you find a spot where the shift linkage will move on all the way to the engaged position? If so, with the lever fully in the R position, grasp the prop and see if it will turn the flywheel, trying both directions. [links]
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