UPDATED Engine overheatCan timing affect engine tempature?

[mjestey]

My engine overheated at high rpms and it has been running a bit funny lately (it doesn't want to idle very well). Last night it melted some tape touching the engine block. Luckily I ran out of gas when I did (or maybe that was the cause of the overheat? Fuel starvation). How fast would an over heat happen at 3000rpms? After an hour and a half it started up hard and then ran like a champ at low speed for 3-4 miles. I just had the water pump replaced recently and it seems to be sending water though the engine, but I am getting steam. I haven't checked the temp of the water coming out. Also it has been at least 2 years since the engine has been timed and it is a 88 evinrude 150. Thoughts? oh current ocean temp is 42 degrees.

 

[wheels4]

Re: UPDATED Engine overheatCan timing affect engine tempature?

MJE,A lean condition or timing can and will make an engine run hot.Good Luck.Jonny

 

[Boatist]

Re: UPDATED Engine overheatCan timing affect engine tempature?

I do not know your motor but in general you should be able to take cover off and touch the head of your motor and not burn yourself. If your motor has a pee hole should have steady stream of water all the time. I would check the thermostate and make sure it opens up near 170 degrees. Also while you have it out look for obstructions in the water passages near thermostat. If your motor has carb for each cylinder I would also pull the plugs and check to see if plug looks normal for each cylinder. If one or more of the carb has a plugged high speed jet can cause that cylinder to overheat and even damage the piston. One more thing you can do is run your motor with the ear muffs and watch the water output when the thermostat opens should be hot but below 170 degrees. Again I do not know you engine so these are just general thing to look for. Good luck.

 

[Spidybot]

Re: UPDATED Engine overheatCan timing affect engine tempature?

'Steam' sounds like water not getting around the cooling circuit. If the pump impeller is fitted correctly there shoul be plenty of cooling capacity - even to cope with some overheating due to bad igniniton or fuel/air mix. The seawater temp. shouldn't make any difference as the system simply increases the amount if need be.<br /><br />I'd check the cooling circuit first. Thermostat sounds very likely and even look for obsticles elsewhere.<br /><br />Although new impeller one must remember, that even a short run without watersupply can ruin it.

 

[mjestey]

Re: UPDATED Engine overheatCan timing affect engine tempature?

I took the boat down to my launch and started the engine to time it and found that water was trickling out of the bolts that attach the water block(?). Thats where the steam is coming from. Replacing that gasket is necessary, but what would have caused this? I just had it put on by a pro (?) and I think I remember salt residue on those bolts almost immediately. Also salt residue above the first and second piston around the same gasket. What are the torque specs on those bolts? My manual doesn't seem to have it. The worst overheat is on the side with the worst leak. (number 1 piston and down) I want to fix this before I attempt the timing. Thanks!<br /> <br />also noticing a clunk every once in a while like someone was switching something on and off. Please tell it is not time for a rebuild!

 

[Spidybot]

Re: UPDATED Engine overheatCan timing affect engine tempature?

Hold your horses! You have to get a PROPER check of your engine. Do not start working on it until you have a good overall idea of what is involved. Purchasing one gasket can be one gasket too many. If it leaks from the cooling circuit (which is around the combustion chamber incl. cylinders and head) ie. from the cover you mention, it may not work properly. If the leak is heavy it keeps water from circulating properly but then you should have seawater coming out in a stream. The weird sound is a different ballgame. Related to the cooling problem or not it must be verified - and that has top priority as it can mean a lot or nothing.<br /><br />Leaks are normally caused by blown gaskets or broken (cracked) engine parts.<br /><br />Your 'pro' mechanic may have an input but you're the one to decide if he's allowed near the engine again.

 

[clanton]

Re: UPDATED Engine overheatCan timing affect engine tempature?

I would do a compression test first. Even with good compression if the engine has overheated 2/3 times the water deflectors behind the heads will need to replace. The bolts on the exhaust cover vibrate loose, should have put OMC sealer on threads before installation. If the leaking bolts were head bolts, then the gasket is probley bad. If it only overheats at high rpm first things to check is waterpump seals, and water deflectors.

 

[rsl31652]

Re: UPDATED Engine overheatCan timing affect engine tempature?

I would not begin a diagnosis without answers to the following questions. Why did you just have impeller replaced? Any decent mechanic would check his work and the amount of water you're leaking would certainly be noticed by him. What other work was performed recently? Is the water leakage from the head gaskets or the powerhead base gasket and what location? What happened to your overheat warning buzzer. Also, if so advanced in that year, (I can't remember offthe top of my head) your power pack should have activated into SLOW if temp was too high. Did it? Although the others are correct that timing can increase temp your system and most others are mechanically advanced so unless you had a rent poer pack or stator replacement, it is highly unlikely that to be the cause. Did your engine overheat prior to the impeller change?

 

[Bob_VT]

Re: UPDATED Engine overheatCan timing affect engine tempature?

You stated "I just had it put on by a pro " well get hold of that "pro" and have them fix it. Something was done wrong.<br /><br />Bob