5.7 EFI exhaust temp

[blackz3]

what should the temp rang be on the exhaust riser on a 1997 merc 5.7L EFI

 

[Scaaty]

Re: 5.7 EFI exhaust temp

As far as I know (I have a Volvo 350), it should be cool running, as it has cold water running against it. It will warm up quite a bit after shut off from heat sink. If there both the same at touch (or close) no prob...one hot, ya got a corroded man.....replace both sides. In salt a few years and toast if not flushed out and maintained best as possible.

 

[blackz3]

Re: 5.7 EFI exhaust temp

replace manifold and riser or just the riser

 

[waterone1@aol.com]

Re: 5.7 EFI exhaust temp

Black,they may not both be even, or not as cool as they should be if you are testing on muffs in the driveway. If you have a heat concern, make sure it is happening in the water (where the water pump can suck all the water it needs).

 

[blackz3]

Re: 5.7 EFI exhaust temp

the test was done by a survayor with a heat gun... i believe he said one was 180 and that was to hot, i havent recieved the written report yet but was wondering what was TO hot and what i could wait to change at the end of the season

 

[Don S]

Re: 5.7 EFI exhaust temp

the test was done by a survayor with a heat gun...

The question is, was it on muffs or in the water, was it at idle or when running under load, closed cooling or raw water cooling?

 

[blackz3]

Re: 5.7 EFI exhaust temp

after sea trail still in da water engines were just shut down and he took the temp reading everything else checked out fine

 

[blackz3]

Re: 5.7 EFI exhaust temp

http://www.yachtworld.com/core/list...broker&&hosturl=channelwest&&ywo=channelwest&

 

[waterone1@aol.com]

Re: 5.7 EFI exhaust temp

I would want to know what the temps are when running. Once the engine is shut off the manifolds and risers will start heating up almost immediately.

 

[blackz3]

Re: 5.7 EFI exhaust temp

thats what im asking WHAT IS THE TEMP SUPPOSED TO BE

 

[blackz3]

Re: 5.7 EFI exhaust temp

in the water at the dock at idle raw water cooled ...

 

[Scaaty]

Re: 5.7 EFI exhaust temp

Originally posted by blackz3:<br /> thats what im asking WHAT IS THE TEMP SUPPOSED TO BE

Like I said in my first reply.. COOL RUNNING ...like in putting your hand on them and leaving it there all day, like in NO TEMP . If this idiot surveyor is heat gunning an exhaust manifold riser AFTER SHUTTING THE MOTOR OFF,.......I know not what for, so good luck.

 

[Scaaty]

Re: 5.7 EFI exhaust temp

As an aside (nice boat by the way), if those manifolds and risers have not been changed in the last 3 years, demand a price adjustment, or have them done before buying it if this boat is used in saltwater. No exceptions...don't take a chance. It should be in the boats records.

 

[waterone1@aol.com]

Re: 5.7 EFI exhaust temp

I would throw my vote towards "warm". When the engine is running, in the water you should be able to put your hand on them and not feel any pain. They will be warm, but not hot. Within two minutes of turning off the engine they will start to get hot, after five minutes, you would not be able to keep your hand on them for any length of time.

 

[smthsaln]

Re: 5.7 EFI exhaust temp

The 5.7 in my 99 Wellcraft operates at around 165 degrees

 

[blackz3]

Re: 5.7 EFI exhaust temp

sorry i thought there was a temp number ...he knocked the price down 3K got an estament of $2500 to change all 4 manifolds and risers...<br />setteled on the price today hope to have her home in 2 weeks!!!!!!

 

[Scaaty]

Re: 5.7 EFI exhaust temp

Originally posted by blackz3:<br /> he knocked the price down 3K got an estament of $2500 to change all 4 manifolds and risers...

Excellent. Best of luck with that beautiful boat!