OMC 1.6liter 1988 with 1988 110 Johnson HELP

[JJordan]

Have low psi. on OMC seadrive motor around about 90psi.Johnson has 132psi but wires are dry rotted and harness but runs good .want to swap blocks to get good psi. will or can I by a cheap harness for this app.Both motors are the same year 1988 and I think the same horse power the OMC is a 1.6 liter cross flow with the bubble so is the johnson I think .Don't have the money to rebuild the omc 1.6 ,or can I put new rings or someting to get better compression.HELP ME SOME ONE SUMMER IS COMMING SOON!

 

[emdsapmgr]

Re: OMC 1.6liter 1988 with 1988 110 Johnson HELP

The powerheads should directly interchange. If you need a new main engine harness, it is 583036, should be still available from Bombardier for just under $ 200.

 

[Dhadley]

Re: OMC 1.6liter 1988 with 1988 110 Johnson HELP

The only basic difference in the 1.6 Sea Drive and the 1.6 outboard may be how the shift hooks up. Some Sea Drives need a boss on the starboard lower pan mount. Look carefully at how your Sea Drive shift cable attaches to the block and compare it to the outboard block.

 

[JJordan]

Re: OMC 1.6liter 1988 with 1988 110 Johnson HELP

Thanks alot for the help also is this a easey job,how long do think it would take .PS what about step by step what to do frist

 

[Solittle]

Re: OMC 1.6liter 1988 with 1988 110 Johnson HELP

Before you go off swapping blocks I would suggest you do a thorough decarb on the one you think is low. That may free up the rings and bring the compression back up.

By the way if you ever need to work on the SeaDrive assemblies you will need a shop manual. They are quite complex. I have twin 1.6L SeaDrives that I've had for 15 years with no trouble from the SeaDrives. I'm told parts are scarce for the drives.

 

[Dhadley]

Re: OMC 1.6liter 1988 with 1988 110 Johnson HELP

Agreed, a decarb would be a great first step. If you are indeed going to swap powerheads the first thing is to look at the shift hook up. You don't want to get all done and have no way to shift the motor.

 

[tashasdaddy]

Re: OMC 1.6liter 1988 with 1988 110 Johnson HELP

this is the procedure i follow.

Decarb, take a can of seafoam put 3/4 of it in the gas tank, with only 1 gallon of premixed gas. put the rest in a spray bottle. start the engine, and let it come up to temperature. then remove plugs, and them some real good shot of seafoam into the cylinders, replace plugs, let sit 15 minutes. restart, and spray the rest of the seafoam into the carbs, so the the motor almost stalls, wait and repeat until the seafoam is gone.then take for a wide open spin. then put in new plugs, ad premixed gas to the tank, and take it for a wide open throttle spin. it is going to smoke like a house on fire, during this process.

afterwards compression.recheck

 

[JJordan]

Re: OMC 1.6liter 1988 with 1988 110 Johnson HELP

Thanks alot for the enfo I will try the decarb trick frist.I also change the prop from a 19pitch to a 17pitch it is on a 1988 Proline center consoul (17ft) Is this worth swaping power heads.The 19 smeed to take a long time to plane out or no plane at all (had to walk to front of boat)but the 17 mackes a it plane out juist fine but burns alot of gas.DO I need to run in the river after the decarb trick or can I check the comp.at the hill let me know what to do PS Smeed to loose top end of speed do to the prop swap

 

[JJordan]

Re: OMC 1.6liter 1988 with 1988 110 Johnson HELP

Still here wanting help with empty pockets is there some one thats going to give me some good pointers about my littel prrrrroooooobbbbblem don't know what to do now looking for sum ideals about the problem in hand WHAT 2 DO next gess I will wait 2 here what u guys think I should DO THANK YOU so much PS about the prop thing I posted also ran 3 or 4 tanks of gas this past summer or the end of summer do you guys think rings could till be stuck or not working right HOPE TO HERE FROM SOMONE SOON.How to post new thread or get enfo one other subjects till next time thank you (new to site)

 

[Dhadley]

Re: OMC 1.6liter 1988 with 1988 110 Johnson HELP

Have you decarb yet? We'll assume so since you want to know what to do next. What was the result? Did the compression come up?

On the prop, going to a smaller prop will in most cases result in a slower speed. That's why simply changing prop pitch to gain rpm is only a last resort. However, with a Sea Drive that's about the only way to gain rpm on a motor that's running correctly. Your's is not running correctly unless the decarb improved the compression.

As for the 90 lbs compression, that may be right. Depends on what heads and head gaskets you have. If it's 90 across the board you may not have an issue with compression.