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jeff_t
New member
Username: jeff_t
Post Number: 1
Registered: 09-2008
| | Posted on Tuesday, September 16, 2008 - 03:55 pm: | 
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New to site, and gm 671, I have a graymarine 671 can you tell year from (serial # 671103849,) (model # 671R0190). my air shelf ?, is very slimy oil & water, Oil leaks from head gasket,and I lose coolant, what engine is this and where do I get parts, piston liners have 64 holes. |
l_ee_waddell
Member
Username: l_ee_waddell
Post Number: 9
Registered: 08-2004
| | Posted on Wednesday, September 17, 2008 - 12:31 am: |
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I imagine that there must be a way to look up a serial number and find out what year it was made. My gm 671 was built in 41, (I didn't know about this post until I got home from the boat)but if I could look at the serial number on my engine and compare it we might know a little more about this subject. My boat was an old WWII Navy boat built at the Bremerton Naval shipyard in 1941 and the gm 671 is the original engine the boat came with. I belive the engine would have to have had a "High Head" conversion however somewhere along the line because when the 671's started out in the early days I was told they had to be started with eather which is not realy something you want to have to do because you can hole a piston and it is very bad for the life of the engine. When the head conversion came along this solved that problem. My engine starts right up so I imagine it would have to have had this done. When you mention Grey Marine I think of the very earliest 671's evre built. Of course everyone knows that if you start a diesel engine with eather long enough, perty soon you will always have to start it with eather and then it will be called an "Eather Bunny". Does your Grey Marine 671 have a Synchronized Gear Pump for it's raw water pump? |
larry_from_maryland
Senior Member
Username: larry_from_maryland
Post Number: 319
Registered: 07-2003
| | Posted on Wednesday, September 17, 2008 - 11:50 am: |
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Water in the air box usually means a crack above it. The weakest place is just inside the blower. The head gasket is made of indiviual parts unless you have a very old one. If you have a small notch near the front between the head and block you have the new head gasket. I can make a guess as to when it was made by looking at the differant changes made over the years. If you have the old head gasket you will have to get one custom made. Most truck parts places used to have the new style gasket. |
larryf1
New member
Username: larryf1
Post Number: 1
Registered: 01-2012
| | Posted on Saturday, April 28, 2012 - 07:56 pm: |
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Looking for Raw Water PUMP with 4 mounting bolts and spline shaft PN 8927296 |
jimmys
Member
Username: jimmys
Post Number: 24
Registered: 01-2011
| | Posted on Sunday, April 29, 2012 - 02:38 am: |
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I have a 6-71 Jabsco Raw/Sea Water Pump listed on eBay,Part # (5122599)..listing # 380425834448,..with only 12 Hours left on the listing.,..or,..are you looking for the original 64HN9-6-71 WW11 R/W Pump, that is a twin shaft/impeller type pump? I have one of those also! Your 64 Port Liners are no longer available and have been updated to Oval Port liners and are available in all the sizes, from the Standard to .001, .005, .010, .020 and .030 Oversizes,..being a dry liner Engine Block and somtimes been bored out to the oversize liner. |
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