overheating

[Cool It]

hello.. I have a 1989 Formula 29 PC with twin 350 mags -alpha 1 outdrives .. the impellers spun off the brass hubs in the out drive and engine overheating. impellers and housings were brand new. mechanic possibly thinks there is to much back pressure --and said something about the oil coolers. any ideas or opinions would help-if more info needed pls let me know Thanks Cool It

 

[Cool It]

Re: overheating

So mechanic says he will back flush system to make sure everthing is flowing correctly . he says the oil coolers could be clogged. or maybe a restriction somewhere else. if all is clear then put in new impellers and try again. other than that he says there really should not be any other reason that the impellers should spin off hub.. any other opinions would be great. Thanks Cool it

 

[Brentathon]

Re: overheating

You had simulaneous impeller failures on both of your engines??? What are the chances of that?
Both engines overheated? At the same time?
You should try to be very specific.

 

[Bt Doctur]

Re: overheating

Have 8 impellers that did the same thing, Sierra claims to have fixed the problem and you may have old stock yet.

 

[Bondo]

Re: overheating

hello.. I have a 1989 Formula 29 PC with twin 350 mags -alpha 1 outdrives .. the impellers spun off the brass hubs in the out drive and engine overheating. impellers and housings were brand new. mechanic possibly thinks there is to much back pressure --and said something about the oil coolers. any ideas or opinions would help-if more info needed pls let me know Thanks Cool It

Ayuh,... OEM, or Aftermarket,..??

You got Junk Parts, not excessive back-pressure...

 

[dubs283]

Re: overheating

the impellers spun off the brass hubs in the out drive and engine overheating. impellers and housings were brand new.

new aftermarket for sure

merc doesn't use brass hubs on their impellers - you got junk parts, not "back pressure"

stick with OEM parts and you will have a lot fewer issues like this one

 

[Cool It]

Re: overheating

Thanks--I will be using OEM for sure--hoping that solves problem--dont want to have to pull boat again until Nov--but lets not even think about end of season LOL--Thanks for the opinions--ill keep u posted on results

 

[Cool It]

Re: overheating

BT Doctur--when did this happen to u --and did you get any further info from sierra on the stock numbers etc of the bad lot of impellers--also did they do anything for u as far as the expense of pulling boat and having work do etc--thanks Cool It

 

[Cool It]

Re: overheating

just wanted to check in with BT Doctur again see if you had any other info--thanks Cool It

 

[Cool It]

Re: overheating

Just wanted to let u guys know that I replaced everything with Merc parts. impellers ,housings etc and the temp is perfect.still looking to find out if BT Doctur had any other info from sierra or any compensation.. Thanks Cool It