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88 20hp Johnson bogging

A

aar684

New member
"Hi Guys,

New to the borum

"Hi Guys,

New to the borum and relatively new to the boating/outboard scene.

Purchased a 14 ft alum. with an 88 20hp johnson on it. Motor ran fine with muffs.

Maiden voyage this weekend. Motor was running great for about an hour. Moving the boat along well.

Without a working depth finder we ended up in very shallow water. Not enough to ground the boat but enough for the engine to hit. There were no rocks or anything like that. The bottom was mud and sand. After getting out of that mess, the motor was not right again.

In neutral the motor would be very slow to respond to the throttle (linkage was fine). I would open up the throttle and having no increase in rpms for 5-10 seconds, then either a jump to high rpms or a bog down and stall.

In gear the action was very similar/leaning more towards the bogging down and stalling.

Could the impeller have gotten clogged/damaged with mud/silt when we ran aground? There is still water "peeing" out the telltale, but I am not sure if it is like it should be, as I am not that experienced.

Before the maiden voyage I put in new plugs with the proper gap setting. Greased everything and changed the lower unit oil.

Help PLEASE!

Aaron"
 
"Running aground....mud, sand,

"Running aground....mud, sand, silt, will enter the water pump assemmbly. You don't say if the engine overheated or not but I will assume that it did for the sake of this reply.

If so, the head bolts no doubt loosened up as did the rest of the powerhead bolts. The majority of the bolts can simply be tightened BUT if the head bolts are even slightly loose, remove the head, clean the sealing surfaces, install a new head gasket, then torque the head bolts 18 to 20 foot pounds. Overheating to a point whereas the head bolts loosen allows water to enter the cylinder(s).

Tighten in the following sequence.

9..10
5...6
1...2
4...3
8...7

Drop the lower unit and install a new complete water pump assembly if needed.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay store at:

http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store"
 
I don't think the engine e

I don't think the engine ever overheated. I took the cover off and that wasn't hot.

The carb sounded as if it was struggling for air. I don't know enough to know if that's it though.
 
check around the prop for any

check around the prop for any fishing line or other obstruction that would hinder operation
 
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