MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone.
You are invited to join our public Boat Repair Forum to seek assistance from other members.
You may also visit the Boat Motor Manuals section of our site to obtain a service manual.
The C means very little to you.---Best to ignore that.
Racerone, I tried to send you another message (or thread) but you apparently didn’t get it seeing I had to re-register to be allowed on the site. So: I am aware of the ring problem and was going to inquire how to tell if it was remedied. But first all spark plugs looked good. I tested all 6cyl for compression and they were all close to same around 100. I am going to recheck soon. We are facing a winter storm here in Minnesota. The motor first bogged at high throttle-I installed a new gas filter, it was badly plugged, nor more bogging. Blew my hat off and went noticeably faster than my 90hp. But it’s is real hard starting. I think it’s the fuel pumps. Ie will put kits in soon as I can. I am hoping that it was overhauled or a least the high ring problem solved so I don’t have to. It’s a 79 ranger 18ft. I paid 1200 cash for boat and motor. The young guy I bought it from had started a rewrite by just cutting all sites out and then of course couldn’t put it back together against. It was used little for 20 years. Sat in a warmed garage the most of its life time. I will do all work myself. Thankful for any advice I can get. GeneI would just install a new factory diaphragm in those 2 excellent / reliable / easy to repair pumps.----What is your motor doing / not doing?----For future reference post the actual compression values.-----Are you aware of the history of broken piston rings on these motors??
I am glad to hear that. There was gas there because the choke caused visable gas to run down choke plate. Could it be because of igniter plugs? Once it ran it restarted good and ran good through wot. I have a manual but it’s trapped in my laptop as I broke screen by closing on earplugs. My daughter is coming from Tucson in April to get it for me on a new unit. ThanksFuel pumps have nothing to do with " hard starting " on a 1979 powerhead.
I will double check those things. All seemed to be good there last fall.For hard starting I would ----Charge the battery.-----Load test the battery.----Take starter apart for inspection ( new brushes ? ) and ohm check on armature.----No money spent to do these simple things.----Reason being that slow or marginal cranking speed means there is weak spark !
I have decided to clean up starter. I was use to 90 hp. The gas is there and I may have missed on speed of turnover. Makes sense. Thanks for help in my thinking. GeneI will double check those things. All seemed to be good there last fall.
I have decided to clean up starter. I was use to 90 hp. The gas is there and I may have missed on speed of turnover. Makes sense. Thanks for help in my thinking. Gene
Here is the stamp. Can you interpret it?There was a TSB issued and if engine was repaired at dealer with low ring pistons there was a letter (dont remember which one) stamped next to welch plug.
There was a TSB issued and if engine was repaired at dealer with low ring pistons there was a letter (dont remember which one) stamped next to welch plug.
There was a TSB issued and if engine was repaired at dealer with low ring pistons there was a letter (dont remember which one) stamped next to welch plug.
There is a stamp near the plug. Looks more like an emblem and not a number or letter. Or looked like a 3 or E inside a D. I tried to send pic but wouldn’t go. But stamp is there. So that would mean compressions would be around 125 in each cyl??There was a TSB issued and if engine was repaired at dealer with low ring pistons there was a letter (dont remember which one) stamped next to welch plug.
Soon as I figure out how. Thanks for your reply.Resize your photo to under 1Mb
Ignore that last sentence for now!There is a stamp near the plug. Looks more like an emblem and not a number or letter. Or looked like a 3 or E inside a D. I tried to send pic but wouldn’t go. But stamp is there. So that would mean compressions would be around 125 in each cyl??
There is a stamp near the plug. Looks more like an emblem and not a number or letter. Or looked like a 3 or E inside a D. I tried to send pic but wouldn’t go. But stamp is there. So that would mean compressions would be around 125 in each cyl??
There is a stamp near the plug. Looks more like an emblem and not a number or letter. Or looked like a 3 or E inside a D. I tried to send pic but wouldn’t go. But stamp is there. So that would mean compressions would be around 125 in each cyl??