If you can get a good used truck cam and roller lifters for a reasonable price Do so. Roller cam and lifters are not cheap that’s why the rebuilder used flat tappet . anything with mercruiser label will be 2 x what it should cost. Not sure if comp cams can recommend a marine stock replacement...
there was no knock sensor on TB4 and I don't think any of the aftermarket marine systems use knock sensors.
check your total advance if that is correct don't worry about the base timing for the moment as your issue of low power will be else where.
If its low would try to disconnect the knock...
to eliminate the alarm while working through just disconnect the temp switch and oil pressure switch. They don't have anything to do with timing or base mode
Double check that you are grounding the purple white wire before starting engine?
I think this is correct but I would need to double check a factory merc manual -https://www.justanswer.com/boat/9vkpv-set-timing-5-7-mercruiser-thunderbolt.html
another way around it is even with an issue going...
Are you having an issue with it and is it the factory set up ? Although it sounds a little longer and higher. My set up is about 4 ft horizontal and maybe 18" vertical maybe 24" if you count to bottom of tank.
This is with an electric pump - no idea if suction lift of pump is different than...
This should be all the parts drawings for your drive https://www.marineengine.com/parts/mercruiser-sterndrive-parts/rmralpha-one-sterndrive-19831990/6225577-thru-0d469858
yes if it is coming from the rear of engine may want to pull the drive and do the same .
The v belt pulleys can get rust on them as well. Look at those while you are inspecting the circ pump
Here are some other options guessed on your engine number they can
https://www.marineengine.com/parts/mercruiser-sterndrive-parts/888-2-bbl-ford-302-v8-19711977/3108723-and-up/fuel-pump-fuel-filter-and-carburetor-rochester
is this why you kept having issues on the water?
I'm with you on this. Seems like the best design is the ones where there is a grease nipple and passages where it will push fresh grease through the bearings and out the dust cap. We have this on our jetski trailer and its fantastic and simple
Shift plate.
You just had the engine out for stringer and transom replacement ?
Would start with what you oultined in first post batt cables , cannon plug. Could be any loose connection from battery up to helm /keyswitch back to engine.
you can easily disconnect interrupt to test, just...
Honestly don’t care what you do, only offering what seems to work for others . sei Drives are about $1600 https://www.go2marine.com/SEI-SE106-Replacement-Sterndrive-1.81
ok, OP is on land but sure...I forgot you do your maintenance while bungee jumping... Seriously maybe if you had a small copper tube on end of lube pump (or lube tube) that would let air out (while its in the vent plug hole) you could probably top up with out removing the cap? or remove the cap...
Sure... as long as a bolt doesn't break or thread in housing strip, which can happen on older drives. Point I was trying to make if you are trying to skate through to end of season touch as little as possible, you would have seen the color of lube and how much it was down by how much more you...
If you find one with hood compression and oil pressure probably would last, ten years who knows, depends on use. Just trying to offer an option at the price point you mentioned. Like I said if you want to keep it best bet is to get longer arms to reach deeper into the pocket
As far as hp you...
Excuse the bluntness but that makes no sense.
You can but why ?? fill it from the bottom. Leave the vent cap on pull the bottom plug, put the pump in and pump till it comes out the vent.
Big issue u want to see if water is getting in there
they still make the pre vortec - 260 hp (w/ 4 bbl carb), 12 bolt intake , mechanical fuel pump
GM changed over in 96 to vortec which has electrical pump. They take a year or so to work through Merc & the boat builder inventories to get into the boat. I believe they were roller cams since the...
