Engine temp

[rtoomey641]

Hi I have 5.0L Mercruiser running Alpha One runs at 160 when cruising but at dock waiting to load 220 stayed there but I thought that was a bit hot is this normal? Standard cooling

 

[NHGuy]

Yes, that's way hot. Is this carburetor or efi?

 

[rtoomey641]

Carb choke was off the scale lean set at one notch lean 2bbl

 

[Bt Doctur]

that would not create a 220 temp.with a 160 stat , you should see 160-165 at idle and have it stay there at cruise.

 

[rtoomey641]

Should I reset idle air mixture

 

[Bt Doctur]

that would not help , when was the impeller and manifolds replaced last?

 

[stonyloam]

+1 with bd, symptoms of a failing impeller in the outdrive. You need to address the issue ASAP.

 

[rtoomey641]

Thanks impeller was changed last year according to previous owner will replace before next time out

 

[enginesilo]

Thanks impeller was changed last year according to previous owner will replace before next time out

I once changed my impeller and the next year it had issues, and it's not always easy to trust a previous owner unless they can show a work order from a mechanic. The impeller isn't a difficult job so consider starting there.

 

[rtoomey641]

So I replaced seawater pump did not look bad also thermostat looked old same problem engine circulating pump?

 

[enginesilo]

Could be a number of things here are some possibilities I've come across on the forums mostly. Many here have lots more experience so trust them over me, but I figured I'd share a response to give you some things to check next.

Many people will ask is it raw water cooler or fresh water? Alpha 1 or Gen 2?Fresh or salt water? How old and how long has this problem occurred and is the boat new to you or you've owned it a long time? How long since you inspected or changed your risers and exhaust manifold?

Impeller/sea pump issues, clogged risers, clogged intake tube between outdrive and housing, collapsed/kinked/clogged tube somewhere along engine and water flow, exhaust flapper or restriction issue, water pickup tube in outdrive issues, impeller housing worn or inferior impeller parts, etc.

Hope this helps a bit.

Might also be worth shooting the engine with an IR thermometer gun but if you are seeing 160 while cruising my guess is your temp gauge is fine.

 

[77GlastronMT]

Make sure the drive belt to the circulating pump is adjusted correctly.