Author Topic: Merc 898/228/260 water temp  (Read 3208 times)

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Offline Plugcheck

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Merc 898/228/260 water temp
« on: August 26, 2018, 01:58:27 PM »
Something happened at the meet to the CVZ that has me somewhat confused.  After nearly getting swamped at the pit by a big river boat, the Z has a noticably louder exhaust note and has trouble holding an idle.  Was finally able last Wednesday to hook it to the hose and it definitely sounds different.  Pumps very little water out exhaust on port side at idle.  Pulled plugs and exhaust, didn't find anything unusual.  Checked timing, was way retarded.  The dizzy has a separate lock down to set timing inside, so it's not adjusted by moving the dizzy body.  This keeps the flat cap aligned.  The internal screw loosened up and allowed timing to retard.  Likely just a coincidence, but happy it happened at end of event.   So here is my question.  I run maybe 130 degrees, thermostat is 190, but appears to only dump in exhuast.  What kind of temps do the rest of you run?
Michael
1979 CVZ-18 388 CI Vortec Mouse
1980 CVX-16SS 140 Mercruiser
1979 CVX-16 Johnson 175
2002 Bennington 2275CC 90 Mercury
1985 Intimidator project
1989 Lowe 200 Redneck fishin Toon
2001 Godfrey Sweetwater pontoon 115 Rude

Offline carlsoncvx18

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Re: Merc 898/228/260 water temp
« Reply #1 on: August 26, 2018, 02:13:45 PM »
Both of my sbc 350cuin run a 143degree thermostat and run at 160 all the time.

Made pretty much a high power run from Prescott to ti temp gauge did not move from 160.
1987 CVX18.     1968 Glastron alpha sail boat
1977 GT150
1986 CV23
1984 Intimiadator
1981 CV27
1969 V-180 fundeck

Offline california special

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Re: Merc 898/228/260 water temp
« Reply #2 on: August 27, 2018, 07:26:58 AM »
I run no t stat and the motor runs 130
just marine tex it!

Offline california special

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Re: Merc 898/228/260 water temp
« Reply #3 on: August 27, 2018, 07:28:18 AM »
Did the exhaust boot rip? Sometimes timing can do funny things with temp
just marine tex it!

Offline Plugcheck

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Re: Merc 898/228/260 water temp
« Reply #4 on: August 27, 2018, 11:44:51 AM »
My first thought was I lost the external rubber flapper on the thru hull exhaust, but that is not the case.  After diving a bit deeper, the issue is the distributor.  This is the odd part, the dizzy rotor is fully adjustable to allow timing to be set without turning the body of the dizzy.  Never seen such before, but considering the flat cap, it makes sense.  Anyway, the hold down clamp was loose, allowing the timing to retard. 
Michael
1979 CVZ-18 388 CI Vortec Mouse
1980 CVX-16SS 140 Mercruiser
1979 CVX-16 Johnson 175
2002 Bennington 2275CC 90 Mercury
1985 Intimidator project
1989 Lowe 200 Redneck fishin Toon
2001 Godfrey Sweetwater pontoon 115 Rude

Offline Jason

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  • 1974 CV16SS, 1986 CV23
Re: Merc 898/228/260 water temp
« Reply #5 on: August 27, 2018, 10:13:43 PM »
Both my boats run 140. Can’t remember what kind of stats.
Jason S.
1974 Glastron Carlson CV16SS 140 I/O
1986 Glastron Carlson CV23 260 I/O

Offline ScottsCVX

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Re: Merc 898/228/260 water temp
« Reply #6 on: August 28, 2018, 03:02:38 PM »
My CVX18 runs at 160.  Putz'n through a long no-wake zone, it will move toward 170
Scott
87 CV 23
79 CV 23
86 CVX 18
84 CVX 16 120hp Johnson
74 GT-160 120hp Mariner

Offline thedeuceman

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Re: Merc 898/228/260 water temp
« Reply #7 on: August 28, 2018, 03:12:00 PM »
Granted ours are fords... but I believe they have a similar cooling configuration both the 1900 and the Bal Harbor Run around 140. I believe they both have 140° thermostat in them


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Joe
75 GT150 "SeaDeuced"... Its Back !!
92 16CSS "Attitude Adjustment" is for sale
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Offline Diamond Chad

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Re: Merc 898/228/260 water temp
« Reply #8 on: August 28, 2018, 04:15:40 PM »
Like Scott, mine was raising from 160 when idling through channels.  Mine was going higher, like 190 before I had a new impeller installed in the outdrive.  Now stays at 160 all the time.
2012 GTR 160 Collectors Edition
87 CVX-18 5.7 (Sold)
88 CVX-16 115 Merc  (Sold)
57 Dunphy Imperial Musky - 57 Golden Javelin
01 Malibu Sunsetter 21 LSV 340 EFI

Offline Terry_Curran

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Re: Merc 898/228/260 water temp
« Reply #9 on: August 28, 2018, 08:59:48 PM »
My deck boat ran about 130 with a 160 stat