Supermutt Posted October 29, 2023 Share Posted October 29, 2023 Here are some additional pics of the V8 I am trying to identify. Hopefully in a week or so I may see it in person. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/ Share on other sites More sharing options...
CF-Firefighter Posted October 29, 2023 Share Posted October 29, 2023 Looks like an 866 Thermodyne to me. If it was gold it would have been an 865 Maxidyne. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541173 Share on other sites More sharing options...
Supermutt Posted October 29, 2023 Author Share Posted October 29, 2023 I know it’s pretty difficult to identify with just some pics. If it’s the 866 I wonder if it’s the 375hp version. I read somewhere that Mack put the 12spd behind the 375. The cab interior pic looks like a 12spd. The truck is supposed to be a 74, R700. So was the 375hp version available in 74 ? So difficult to get definitive info on the old v8’s. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541174 Share on other sites More sharing options...
CF-Firefighter Posted October 29, 2023 Share Posted October 29, 2023 I believe it was. I don’t think the 864 made it out of the 60’s. Atleast in fire trucks the 865/866 were available I think 73-79ish time frame in CF-700’s Most 866’s were 375 hp. I’m sure they had some lesser ratings for oddball stuff. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541175 Share on other sites More sharing options...
Supermutt Posted October 29, 2023 Author Share Posted October 29, 2023 Was the 375, 866 any better than the 864 or 865 ? I am wondering if it’s worth picking up. I am kinda surprised at how clean it is. Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541176 Share on other sites More sharing options...
CF-Firefighter Posted October 29, 2023 Share Posted October 29, 2023 (edited) 865/866 are the same engine. Some different parts. One is a Thermodyne, One a Maxidyne. But physically they are identical. I believe so. I’m not an expert by any stretch but own an 865. It doesn’t leak and runs very well. They seem built tough, just repairs are expensive and hard parts are a bit of a search. I’m not scared of mine, it’s just in a toy though it’s not a working truck. don’t think there were any huge issues. I’ve heard of people talking about rolling bearings in them after some time for prevention, an oil pump relive spring that can get weak, head gaskets if not kept torqued. But other then that nothing that I know of. Edited October 29, 2023 by CF-Firefighter 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541178 Share on other sites More sharing options...
Supermutt Posted October 29, 2023 Author Share Posted October 29, 2023 Might be able to pick up the whole truck for $1500. I am trying to get the vin. All I know is it was parked 3 years ago. Has a water tank on it. He said it ran good when parked. He picked up a newer water truck. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541179 Share on other sites More sharing options...
Popular Post D-Day Posted October 29, 2023 Popular Post Share Posted October 29, 2023 Just forward of the starter on the edge of the block above the oil pan is where the identification numbers are stamped I think cab over engines were stamped at the right rear 4 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541183 Share on other sites More sharing options...
Popular Post mechohaulic Posted October 29, 2023 Popular Post Share Posted October 29, 2023 5 hours ago, CF-Firefighter said: Looks like an 866 Thermodyne to me. If it was gold it would have been an 865 Maxidyne. have to agree on the thermodyne ; can't remember them being the light blue. course that's NOT the only thing I can't seem to remember lately 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541192 Share on other sites More sharing options...
mechohaulic Posted October 29, 2023 Share Posted October 29, 2023 4 hours ago, Supermutt said: I know it’s pretty difficult to identify with just some pics. If it’s the 866 I wonder if it’s the 375hp version. I read somewhere that Mack put the 12spd behind the 375. The cab interior pic looks like a 12spd. The truck is supposed to be a 74, R700. So was the 375hp version available in 74 ? So difficult to get definitive info on the old v8’s. I worked Mack trucks '69--'75 ; the 866/// 375 was around before I left. shift defiantly looks to be 12 speed wouldn't be hooked to 865 maxi. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541193 Share on other sites More sharing options...
mechohaulic Posted October 29, 2023 Share Posted October 29, 2023 this R700 :V8 topic sure has the interest for me .. back then I delivered a brand new R-700 (V-8) to a construction co in this town (watertown,CT ). doubt the co like many aren't around any more . Watertown construction ??; not dayton construction= they are still around. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541194 Share on other sites More sharing options...
Popular Post D-Day Posted October 30, 2023 Popular Post Share Posted October 30, 2023 The 864 was finished in 1972 and the ET 1000 did not come out until 1978 so a look at the numbers is important but it all looks good 3 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541214 Share on other sites More sharing options...
fjh Posted October 30, 2023 Share Posted October 30, 2023 It’s likly a 375! If it was a 325 it would likly have a six speed Trans! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541215 Share on other sites More sharing options...
Popular Post Brian L Blaylock Posted October 30, 2023 Popular Post Share Posted October 30, 2023 It’s more than likely a endt-866 with a 12 speed but it could possibly be a endt-865 with a air shift 6 speed the engine number will be stamped on the block as described in a previous comment if it is a factory endt-866 the truck vin will start out as R-797 a truck with the endt-866 will be R-795 3 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-541221 Share on other sites More sharing options...
Full Floater Posted July 7 Share Posted July 7 Old post, but I have an 866-375hp that can be up for grabs very reasonably, if someone needs one (located in BC Canada). It's a "running" engine with what was diagnosed as a valve train knock. Not sure what exactly is going on as I have not looked very far into it. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554835 Share on other sites More sharing options...
fjh Posted July 7 Share Posted July 7 9 hours ago, Full Floater said: Old post, but I have an 866-375hp that can be up for grabs very reasonably, if someone needs one (located in BC Canada). It's a "running" engine with what was diagnosed as a valve train knock. Not sure what exactly is going on as I have not looked very far into it. Quite likely a loose valve seat quite common on these! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554852 Share on other sites More sharing options...
Full Floater Posted July 7 Share Posted July 7 2 hours ago, fjh said: Quite likely a loose valve seat quite common on these! Oh ya. Perhaps I should have an extra cup of coffee one day and pull off the head in question. Which apparently is the drivers side rear Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554861 Share on other sites More sharing options...
mowerman Posted July 7 Share Posted July 7 Hell, I’m thinking if you want to sell it, there’s probably a lot of guys on here. Interested in it good luck.Bob Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554864 Share on other sites More sharing options...
mowerman Posted July 7 Share Posted July 7 But I’m sure most of them are a long ways from you shipping$$$$ Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554865 Share on other sites More sharing options...
Full Floater Posted July 7 Share Posted July 7 4 minutes ago, mowerman said: But I’m sure most of them are a long ways from you shipping$$$$ Yes.....not to many Mack guys in these parts. I feel like a lone wolf. OR.....a lone bull dog! Hahahah 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554866 Share on other sites More sharing options...
mowerman Posted July 7 Share Posted July 7 Yeah, same here. I’m in Reno and there’s a few around there, but I really don’t know any of them personally just a couple of LT’s in town that’s about all I really know about…. I was very fortunate to find a rebuilt transmission around 60 miles from here. I thought I was gonna have to travel a lot further … bob Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554867 Share on other sites More sharing options...
fjh Posted July 7 Share Posted July 7 1 hour ago, mowerman said: Yeah, same here. I’m in Reno and there’s a few around there, but I really don’t know any of them personally just a couple of LT’s in town that’s about all I really know about…. I was very fortunate to find a rebuilt transmission around 60 miles from here. I thought I was gonna have to travel a lot further … bob Well we got your backs bros! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554873 Share on other sites More sharing options...
The Heinz Posted July 8 Share Posted July 8 16 hours ago, Full Floater said: Yes.....not to many Mack guys in these parts. I feel like a lone wolf. OR.....a lone bull dog! Hahahah I've gone down the old off-highway truck rabbit trail lately, and have fallen in love with Pacific trucks that ruled the woods of BC. I don't know if you have ever dealt with any Pacifics, but they have absolutely won my heart from watching the old film videos of those trucks hauling loads of logs taller than my house. Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554890 Share on other sites More sharing options...
Full Floater Posted July 8 Share Posted July 8 10 hours ago, The Heinz said: I've gone down the old off-highway truck rabbit trail lately, and have fallen in love with Pacific trucks that ruled the woods of BC. I don't know if you have ever dealt with any Pacifics, but they have absolutely won my heart from watching the old film videos of those trucks hauling loads of logs taller than my house. Oh they are around, no doubt. Don't see em everyday...but they're out there. Quote Link to comment https://www.bigmacktrucks.com/topic/73472-1974-v8/#findComment-554919 Share on other sites More sharing options...
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