95Johnson130 v4 temp differences

[SCO]

This motor did not have tstats, but has 130 psi all around and hasn't been run much in this warm environment since tstats removed. I replaced tstats, and notice the left side heads seem hotter to the touch than the r side. Is this normal? I would think the first tstat to open at idle on the flushette would then cool both heads(they are connected) and keep the other sides tstat from opening and resulting in a hotter side and a cooler side. Is this accurate? <br /><br />I am also thinking of putting in temp senders and monitoring both side head temps on the dash. Where can you get these kinds of accessories, and is there a preferred brand? Does OMC make them? My local parts dealer has not been able to find these answers for me. Thanks

 

[clanton]

Re: 95Johnson130 v4 temp differences

There was a post from someone this board that had a 130,one side 20-30 degrees hotter, said that he shimmed one of the thermostat to get both heads the same temp. If you find the post, bump it back to the top, I would like to reread the post.

 

[93bronco]

Re: 95Johnson130 v4 temp differences

i found the post i believe clanton was talking about and bumbed it up. good info.<br />"mysterious overheating ob"

 

[jim dozier]

Re: 95Johnson130 v4 temp differences

I purchased a temp gauge and sending unit kit that connects to a head bolt at West Marine. So far it is working good.

 

[SCO]

Re: 95Johnson130 v4 temp differences

Update. I took the boat out and after 20 minutes the overheat horn went off, so I took the t'stats out. I figure that something is preventing proper heat transfer. Fish hunters story, http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=032358 , has me worried about putting the stats back in. I have some suspicions about possible causes for the overheating.<br /><br />1)bad impeller doesn't supply enough pressure<br />2)Motor has been run in saltwater without flushing with fresh. The corrosion and scale buildup insulates cooling water from the cylinders requiring the increased water flow from removed tstats(I a assuming thet the tstats are open and the engine overheats anyway)<br />3) Too lean cause of clogged carbs or timing advanced<br />4) Boat is too heavy and motor is working at full load<br /><br />I think the Rx is to get temp senders and start collecting data. There is a threaded cavity in each block half near the tstats that look like they are designed for temp senders. Can I get temp senders that fit those threaded cavities?

 

[fishhunter911]

Re: 95Johnson130 v4 temp differences

hey thats me..... anyway... the carbs were rebuilt and the time adjusted.... i took it back to the shop and i am awaiting the dreaded phone call.

 

[93bronco]

Re: 95Johnson130 v4 temp differences

i had the same issue < along with FH911> <j/e 120/140><br />took it into shop for a thorough check. needed new p/p<br />came back running great. after the 3rd time on water- it overheated.<br />i changed out tstats to find no vernatherms in old white housings. <br />put new black ones in, retorqued heads.<br />got real hot fast!!!!!!!<br />upon disassembley i found<br />1- one of the recirculatory fittings crimped and hose left to suck air.<br />2- severe corrosion in area around cylinder sleeves<br />3- recirculatory check valves & some fittings in need of replacement.<br />4- heads in need of resurfacing<br />5- 4 scored cylinders<br />6- slite grooves in impeller cup, but impeller fairly new.<br />why did it over heat? it had to be 1 if not all the above. but as with fh911, i too feel that the shop should have caught the tstats atleast.