djanzen186
Recruit
- Joined
- Apr 9, 2016
- Messages
- 4
Have a 1974 Mercury 500 (50 HP) hasn't ran in a year and a half. Last owner said last time it was ran it started smoking white smoke out of cover was shut off and not turned back over. Was never properly winterized. Below is a list of what I have tested and done so far.
Compression Test: Cyl. 1. 120 - 123, Cyl 2. 119 - 121, Cyl 3. 105 - 112, Cyl 4. 110 - 118 (Note: Test was done cold engine, electric start, 5 Cranks Per test, 3 tests per cylinder)
Repaired wiring harness, cleaned all grounds, coated all with dielectric grease.
New Impeller Kit (note: old impeller only had half of a vein left was completely shredded)
Carbs were pulled and were clean, parts washed and changed all gaskets, Idle set screws are 1.5 turns CCW
New clean fuel tank and line with new 87 Octane mixed 50:1 with cap of Seafoam stabilizer.
Fully Charged Battery
New Fuel pump diaphragm and Gaskets reinstalled.
New Spark Plugs (note: when checked after starting have fuel on them, mixed with some black soot)
Not engine related but swapped out the gear oil, was milky, so fresh oil installed bottom up.
When attempting to start noticeable exhaust exiting port, no popping.
When priming fuel bulb can see fuel come out overflow on the carbs. Fuel bulb stays firm but not hard slowly decreases in pressure over time.
Type III Ignition system, no spark test as I don't own a spark tester, but 1/4" jump with noticeable arc. Now when engine grounding arc also shocking through the key and cable.
In closing I guess I am at a loss as what to test next or where to go. I am always starting it with a flush kit attached at high water pressure and with a battery charger hooked up.
Compression Test: Cyl. 1. 120 - 123, Cyl 2. 119 - 121, Cyl 3. 105 - 112, Cyl 4. 110 - 118 (Note: Test was done cold engine, electric start, 5 Cranks Per test, 3 tests per cylinder)
Repaired wiring harness, cleaned all grounds, coated all with dielectric grease.
New Impeller Kit (note: old impeller only had half of a vein left was completely shredded)
Carbs were pulled and were clean, parts washed and changed all gaskets, Idle set screws are 1.5 turns CCW
New clean fuel tank and line with new 87 Octane mixed 50:1 with cap of Seafoam stabilizer.
Fully Charged Battery
New Fuel pump diaphragm and Gaskets reinstalled.
New Spark Plugs (note: when checked after starting have fuel on them, mixed with some black soot)
Not engine related but swapped out the gear oil, was milky, so fresh oil installed bottom up.
When attempting to start noticeable exhaust exiting port, no popping.
When priming fuel bulb can see fuel come out overflow on the carbs. Fuel bulb stays firm but not hard slowly decreases in pressure over time.
Type III Ignition system, no spark test as I don't own a spark tester, but 1/4" jump with noticeable arc. Now when engine grounding arc also shocking through the key and cable.
In closing I guess I am at a loss as what to test next or where to go. I am always starting it with a flush kit attached at high water pressure and with a battery charger hooked up.
