New 540 with crossover hotter on starbord side
 

Looking for some HELP! Freshened up and added some goodies to my 540 Bulldog. Ditched the water pump and installed a crossover also. Fired up today and the starboard / right side head is considerably hotter than the left. Temp sending units from the intake read ok but that right head feels much warmer. Thanks in advance

What kind of upper housing are you using? How much warmer? A few degrees no biggie but 50 and there is a flow issue.

The stat housing is the one that came with crossover from Eddie Marine. I will get a digetal laser thermometer and get accurate temps readings from the same spots on both heads. Stand by make take a couple of days THANKS

The stat housing came with the crossover from Eddie Marine. I will get a digetal laser thermometer and check temps on both heads in the same spot. I suspect it , may be 50 deg + or - few but I will check. Please stand by, it may taka a couple of days. THANKS

are you running the one with a by pass ? with thermostat ? if so did you drill 4-6 1/8 holes in it ?

Not sure what you mean. Not at the boat right now. But I'm pretty sure it has a only two 1" lines off the top of the stat housing. There is a stst installed and no drilling of any holes any where was done. Perhaps we should have??? Thanks again

Please explain the hole drilling. Thanks

No by pass on this unit.

I had a similar issue and it turned out to be a bad raw water pump housing. The housing was grooved and wouldn't build full pressure. Not sure if this will solve your problem but it may be part of the problem if yours is like this.

if theres no bypass then take the stat out and run it. ill bet your problem is fixed and if you don't mind running colder temps then leave it out, but if you want to run a thermostat then you need a crossover with a bypass. also if you do end up using a kit with the bypass, make sure you drill some holes in the stat.

thats it...can't run a stat without a bypass

125 to 130 on the starboard head 100 to 105 0n the other. Temp gage never goes above 125 -130 on the city water hose. Stat installed with holes drilled from Eddie Marine? Ideas. Really wishin I had left the pump on. This is more trouble than it is worth!

id if you do not have a bypass running off the top of the therm housing down to the crossover you cannot leave the stat in holes or not

We told you what your problem is. Get a kit with a bypass and Ur all set

OK. This kit is brand new from Eddie Marine, just installed. I wonder what my odds are of getting my $$$ back from them. HA! HA! I will order another unit with a by pass. I hope somebody from Eddie reads these posts because they told me what unit to purchase and install. Then said they have never heard of any problems when called to discuss the issues. Perhaps thier salesman are not practicing boaters. Or perhaps they are sailsmen not powerboaters Thanks again

OK guys. I dropped the bucks and bought another crossover with the by-pass. Had it over nighted $$, installed it, and guess what? No Change. Still the same as described above. Now what? Next thing is to throw the whole freekin thing away, buy a new water pump and pulley, reconfigure the belts back to the way they were and try to put this nightmare behind me? What do you think?

It should work, its the same one I use. I have been using it for 6 or 7 years. Did you drill holes in the thermostat? That has to be done to release steam/air, it kind of ballances things out. The only problem I have had with mine is when the water is really cold I cannot get the engine over about 130 deg, I like mine to run at about 160. Good luck and be patient with it, your problem may be somwhere else.

same here..used one for 5 years..worked fine...just sold the boat friday...

Did you drill the holes in the thermostat?

When was the last time you changed your impeller? Is the water coming out of the exaust even on both sides? Try puting it in the water and runing it and then check the temp.

what changes did you make, what intake ? are you running just on the hose or have you put in the water ?

Impeller new & pumps like a son of a gun. Holes in stat. Stat changed to new stat with holes. I think exhaust water is even. I will check more closley next time run. Perhaps it isn't?? So this not over 130 or so when water is cold is common with the crossover?

i really wouldnt worry about it. if your water isnt boiling in the pipes when your come off plane after a hard run then your never going to have a problem. watch your water temp gauge and if it starts to get up around 200 then start to worry if it never gets up there dont sweat it. i am running 540's with the same set-up and never see water temps above 150.....

You should have at least 3 holes drill in the stat, if your still running warm, you can go bigger than 1/8 inch holes. Sometimes the stats from the factory come with one or 2 holes predrilled, if so,.....drill more.

This might help.... Look closely at the pic and youll see the hole drilled. Spread the holes(3) out evenly around the stat.......

http://www.offshoreonly.com/forums/g...hermostat.html

I can tell you if you are going by what what its doing on the hose it wont be accurate. Thoes things pump more water than the hose can put out.

Don't overthink things, you may have nothing wrong. Sounds like you have done everything OK. I have the same crossover setup, with a 160 deg thermostat. My temp gage runs a little over 150 when on plane. If you see a little warmer temp at idle that seems to be normal, mine runs about 160-170. Take it on the water and run it, let us know what you find out.

Ran it last night on the river and as on the hose it runs cold! Very cold! Even colder than on the hose! 100-110 degree cold on the stat and one head. 130 on the starbourd head. At Idle all is at 100 or less. That is way to cold to run the engine. I have given up and am ordering a new pump and pulley today and going back stock. I want to boat not be under the hatch. Want a new crossover cheap!

That's not too cold man. That was at night when temps are down. YOu sure as hell won't break anything running cold(;

Where do you put in on the river I am also in cincy.

Rivertown. On my trailer in building A. Won't let them rack it!

Rivertown. On my trailer in building A. Won't let them rack it?

I usually put in at shmidt field when i go to the river. I also have just put a crossover on mine. With the circ. pump the temps.stayed at 140. I shure hope I dident screw up!

On the crossover, did you feed the water hose from the pump to the center of the crossover or on either end?

When you install a crossover system you should also install a water pressure guage on the block. Your engine water pressure should not exceed 25 psi at WOT, this can be controlled by the bypass size and exhaust outlet size. I suggest you inspect the inlet side of the oil cooler and look for old impeller parts or debris. I just had a nightmare engine that one header would overheat at WOT, the engine always showed proper temp, the other header was cool to touch. After replacing everything in the system I pulled the oil cooler and could not believe how much junk was in the inlet side of that cooler and the engine still held temp. We backflushed it many times, the debris never showed but was there. I checked it with a mirror to find the debris. Good Luck.

Crossover gone, all problems gone!!! All temps are perfect on gauges, and with infarred, at manifolds, block, etc. NOTE TO ALL -DO NOT EVER INSTALL ONE OF THESE UNITS ON YOUR ENGINE! I don't care if you drill one hole or six holes in the stat. Run a 165 stat or no stat. Run a unit with a by-pass or no by-pass. Have a clogged cooler of no cooler at all. Feed from the right, feed from the left, run on a hose or in the water. THEY ARE TROUBLE! Anyone want to buy one slightly used cheap? What a freekin nightmare!

like I said ran one for 5 years...no issues

Well, I have run one for years, you never posted a pic so we cannot even see how you had it plumbed. Glad you have it fixed, but don't condem a system that works.

Glad they work for you but I have heard just as may horrer stories also. Thus the condemnation. It is like anything else, not everything works the same in every application.