Travis 16 Posted March 5, 2019 So I have just put my new 351 in my car, it has been bored 20tho, I have the thermostat opening at 90, and the temp seems to sit around 100 degrees, is this normal? I have a big Aussie desert coolers radiator with 2fans, the 302 I had before this never went over 90degrees, Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
bear351c 10,270 Posted March 5, 2019 Couple of things you can check........ Bottom rad hose collapsing when you rev.?? Ignition timing?? Was there a brass orifice plate under the Thermostat?? Fans blowing the right way?? You can swap out the Thermostat for a colder one. Clevos can run quite warm, depending on how thick the cylinder walls are, water pump condition, fan belt slipping etc, etc. If it's just rebuilt and tight, it will run warmer until it frees up a bit. The twin fans should be plenty. 1 Thom reacted to this Share this post Link to post Share on other sites
Ando81 2,949 Posted March 6, 2019 +1 for the ignition timing, I’ve heard it causing a lot of people trouble keeping their clevo’s cool Share this post Link to post Share on other sites
ESPSIX 143 Posted March 6, 2019 Get rid of the desert cooler for a start. Share this post Link to post Share on other sites
ESPSIX 143 Posted March 6, 2019 Apart from the crappy radiator, is the thermostat actually working, do you have the resrictor plate under the thermostat, what kind of water pump are you using, the ones with individual blades can have cavitation issues, are the fans fully shrouded, and are your head gaskets on the right way, although it doesn’t sound bad enough for that, the heads would be getting very hot. Share this post Link to post Share on other sites
Travis 16 Posted March 7, 2019 Couple of things you can check........ Bottom rad hose collapsing when you rev.?? Ignition timing?? Was there a brass orifice plate under the Thermostat?? Fans blowing the right way?? You can swap out the Thermostat for a colder one. Clevos can run quite warm, depending on how thick the cylinder walls are, water pump condition, fan belt slipping etc, etc. If it's just rebuilt and tight, it will run warmer until it frees up a bit. The twin fans should be plenty. is this the plate under the thermostat you are talking about?Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
Travis 16 Posted March 7, 2019 Yep.Are you saying I should pull it out?Sent from my iPhone using Tapatalk 1 bear351c reacted to this Share this post Link to post Share on other sites
bear351c 10,270 Posted March 7, 2019 No.! Never........ Just asking. Some people rip them out when cleaning out the block, acid dipping, etc..... It's required for distribution of the coolant to the right areas. Share this post Link to post Share on other sites
Travis 16 Posted March 7, 2019 I have put a thermostat in the opens at 71 and it got to 100 faster then before, timing is set at 14 at the moment, not sure what else to doSent from my iPhone using Tapatalk Share this post Link to post Share on other sites
bear351c 10,270 Posted March 7, 2019 Timing should be around 6-8 degrees ? Share this post Link to post Share on other sites
Travis 16 Posted March 7, 2019 Timing should be around 6-8 degrees ?Would being at 14 make it go up to 100 in 15min? Also could the head gaskit be on the wrong way and cause this?Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
gerg 10,871 Posted March 7, 2019 14 might be OK at idle but will be too much at cruise/load (if running the stock Bosch dizzy and curve)I thought the head gasket thing only caused hot spots on particular cylinders, not overheating the entire engine. Might well be wrong about that one.How new is your balancer? The outer ring can slip over time and give you an incorrect timing mark.How about you just advance it to where the engine seems smoothest, has the highest idle, and highest vacuum reading? That way, you know it's not a retarded ignition causing the hot running. Then drop the idle speed and adjust mixture to suit. See if that makes a difference. Sent from my CPH1607 using Tapatalk Share this post Link to post Share on other sites
Travis 16 Posted March 7, 2019 14 might be OK at idle but will be too much at cruise/load (if running the stock Bosch dizzy and curve)I thought the head gasket thing only caused hot spots on particular cylinders, not overheating the entire engine. Might well be wrong about that one.How new is your balancer? The outer ring can slip over time and give you an incorrect timing mark.How about you just advance it to where the engine seems smoothest, has the highest idle, and highest vacuum reading? That way, you know it's not a retarded ignition causing the hot running. Then drop the idle speed and adjust mixture to suit. See if that makes a difference. Sent from my CPH1607 using TapatalkIs there a way to check if the gasket is on wrong without pulling the heads off?Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
gerg 10,871 Posted March 7, 2019 Is there a way to check if the gasket is on wrong without pulling the heads off?Sent from my iPhone using TapatalkIf you used Fel-Pro, one would be put on "upside down" ie: the writing will face the opposite way to the other side. I think from memory, the passenger side faced down. No there isn't a way to see other than popping the heads. Although you could get away with doing just the passenger side first because this sounds like the one to get wrong. Sent from my CPH1607 using Tapatalk Share this post Link to post Share on other sites
ESPSIX 143 Posted March 7, 2019 I only mentioned the head gasket because it is an easy mistake to make, it blocks the water gallery where the water passes from the head to the block at the front from memory, but it makes the motor run quite hot, so that would be the last thing I’d check and if it’s only one, only the head affected would be hotter. Share this post Link to post Share on other sites
Travis 16 Posted March 7, 2019 I pulled the timing back to 8 degrees and at 3000rpm it’s at 20degrees and still going up to 100Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
bear351c 10,270 Posted March 7, 2019 Head gasket sounds like the culprit. Done it once myself..... 1 gerg reacted to this Share this post Link to post Share on other sites
Travis 16 Posted March 7, 2019 Ok so I put a thermometer that can like to my phone in the top radiator hose and took the car for a drive, while moving it sat between 92-95, so it was trying to keep cool, when just sitting in the driveway it sat at 97 and didn’t seem to go any higher, I only left it sitting for a few min tho, so I know at the temp gauge sender it will be hotter but it did show that the temp would go up and down, so it was trying to cool, I’m starting to wonder if it is the radiator even tho it’s only about a year old, what do you all think? I’m really lost for ideas at the moment Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
ESPSIX 143 Posted March 8, 2019 See my first comment. Share this post Link to post Share on other sites
Travis 16 Posted March 8, 2019 See my first comment. Haha I know, but I just can’t get past that the radiator was working perfectly 6weeks ago behind a 302, all I have done is changed to the 351Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
ESPSIX 143 Posted March 8, 2019 A tired old 302 to a nice tight 351 with a bit of core shift might just be enough. it doesn’t sound like it’s over heating, just running hotter. some people love the Aussie desert coolers, the few times I’ve had personal experience with them, I’m not a fan. easy to swap out a radiator to find out if it is the issue. Share this post Link to post Share on other sites
ESPSIX 143 Posted March 8, 2019 As Bear351c said, are your fans spinning the correct way, are they coming on at the right temp, are they fully shrouded? Share this post Link to post Share on other sites
Travis 16 Posted March 8, 2019 Yes to all, maybe I need a third fan on the other side of the radiator pushing the air in,I’m hoping it just runs hot and will cool down once it’s run in a bit, if not I have no idea, Sent from my iPhone using Tapatalk 1 bear351c reacted to this Share this post Link to post Share on other sites
bear351c 10,270 Posted March 8, 2019 I ran a 6 cyl XF rad on my 351 for years, no issues. Easy to fit, cheap to buy. Swap it out, may have been alright in the 302, but needs a little more cooling for the 351. Just had a thought........ you get all the air out when you filled her up? Run the engine until it's warm, take off cap (slowly.!) and see what the level is. Top her up with coolant while it's idling, with the thermostat open so the block fills up completely. Share this post Link to post Share on other sites