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+--- Thread: isx15 cm2350 pushing coolant (/showthread.php?tid=9926)
isx15 cm2350 pushing coolant - TomHanson - 01-24-2025
Kind of an odd duck, wanting some opinions. Engine is demandated with a fresh (aftermarket kit) overhaul, about 15k miles. New aftermarket head as well. Liners were cut to .012in(I already know @rawze 's skin will be crawling for not being set to .014, I apologize lol.) Anyways, this engine recently started pushing coolant. Driver made it back up to us a couple hundred miles away with the cap loose, and did not lose a drop. Engine does not seem to be burning any water, the tail pipe is clean and there has not been any white smoke. The truck can be dead cold, and create 10 psi in the cooling system within 30 seconds of running. I already bypassed the compressor head. Tested for combustion in the coolant system to no avail. With that being said, am I missing something simple here? Don't want to rip the head off to find nothing...
RE: isx15 cm2350 pushing coolant - tree98 - 01-24-2025
Drop the oil pan, pressurize the cooling system to 20 psi and let it sit overnight. The next day slowly bar the engine over while someone is underneath looking up for drops of coolant. Look closely they can be small.
RE: isx15 cm2350 pushing coolant - TomHanson - 01-24-2025
(01-24-2025 )tree98 Wrote: Drop the oil pan, pressurize the cooling system to 20 psi and let it sit overnight. The next day slowly bar the engine over while someone is underneath looking up for drops of coolant. Look closely they can be small.
No coolant in oil visually or according to the oil sample. Not a bad idea though at this point. I'm curious if a liner isn't cracked...
RE: isx15 cm2350 pushing coolant - Mr Hagg - 01-24-2025
We never use aftermarket as I have seen to many variances in so many we have rebuilt where they went the cheap way first. Did you bolt down all liners and check in atleast 4 points of liner? Reason I ask is highway heavy duty had some liners we replaced a while back that was cut different. So when we measured the liner they was off. At first I thought who ever cut counter bore maybe didnt care and just cut it. After pulling liners we found it to be perfect and once check liners we found them to be all different heights. Also we have found the reason we dont send heads to machine shops and only use oem heads was from combustion getting under injector cups where they didnt install right. Also finding broken valve cracked from them being cut to low. None of this may be your case just letting you know what we have found in the past. Yo may also want to check the egr cooler if no one block the front off from exhaust gas this can be a issue as well if cooler is leaking. They way we check our engines from combustion leaks : install pressure gauge and pump to 5 psi to make sure its holding pressure. Start engine, bump idle to 1100 rpm, using calterm we manually run up vgt to 80% this will create a good bit of back pressure and if there is a leak youll see gauge rising up to 20 psi with relief cap plugged off....
RE: isx15 cm2350 pushing coolant - Rawze - 01-25-2025
(01-24-2025 )TomHanson Wrote: Kind of an odd duck, wanting some opinions. Engine is demandated with a fresh (aftermarket kit) overhaul, about 15k miles. New aftermarket head as well. Liners were cut to .012in(I already know @rawze 's skin will be crawling for not being set to .014, I apologize lol.) Anyways, this engine recently started pushing coolant. Driver made it back up to us a couple hundred miles away with the cap loose, and did not lose a drop. Engine does not seem to be burning any water, the tail pipe is clean and there has not been any white smoke. The truck can be dead cold, and create 10 psi in the cooling system within 30 seconds of running. I already bypassed the compressor head. Tested for combustion in the coolant system to no avail. With that being said, am I missing something simple here? Don't want to rip the head off to find nothing...
what di you expect. garbage overhaul kit. garbage head. Likely garbage programming, garbage everything ...
garbage in = garbage out.
what a complete waste of someone's money .. all in the name of 'saving a few bucks'.
10 psi in the cooling system in 30 seconds = dancing liner, or head, or head gasket problem.
- pressurize coolant system over night with oil pan off it. Looks for coolant sneaking around a piston ring. I would also sat Look for coolant buildup in back of egr cooler, but egr cooler is not going to make 10 psi in coolant system at idle.. and definitely not that quickly.
- Copy program from ecm and e-mail to to me for a proper review of what someone did in there. Could be killing the engine for all anyone knows.
if it is the head/head gasket... then go buy all OEM components this time and start over + fix any bad programming. That or send it down the road to the next shop, who might be willing to keep butchering it into oblivion like it already has been.
These red engines are completely unforgiving if things are not done to exacting standard. HJere is what should have happened...
ref: http://rawze.com/forums/showthread.php?tid=8105&pid=70606#pid70606
anything less and its nothing but a waste of moneys and repeat of history.
RE: isx15 cm2350 pushing coolant - TomHanson - 01-27-2025
(01-25-2025 )Rawze Wrote:(01-24-2025 )TomHanson Wrote: Kind of an odd duck, wanting some opinions. Engine is demandated with a fresh (aftermarket kit) overhaul, about 15k miles. New aftermarket head as well. Liners were cut to .012in(I already know @rawze 's skin will be crawling for not being set to .014, I apologize lol.) Anyways, this engine recently started pushing coolant. Driver made it back up to us a couple hundred miles away with the cap loose, and did not lose a drop. Engine does not seem to be burning any water, the tail pipe is clean and there has not been any white smoke. The truck can be dead cold, and create 10 psi in the cooling system within 30 seconds of running. I already bypassed the compressor head. Tested for combustion in the coolant system to no avail. With that being said, am I missing something simple here? Don't want to rip the head off to find nothing...
what di you expect. garbage overhaul kit. garbage head. Likely garbage programming, garbage everything ...
garbage in = garbage out.
what a complete waste of someone's money .. all in the name of 'saving a few bucks'.
10 psi in the cooling system in 30 seconds = dancing liner, or head, or head gasket problem.
- pressurize coolant system over night with oil pan off it. Looks for coolant sneaking around a piston ring. I would also sat Look for coolant buildup in back of egr cooler, but egr cooler is not going to make 10 psi in coolant system at idle.. and definitely not that quickly.
- Copy program from ecm and e-mail to to me for a proper review of what someone did in there. Could be killing the engine for all anyone knows.
if it is the head/head gasket... then go buy all OEM components this time and start over + fix any bad programming. That or send it down the road to the next shop, who might be willing to keep butchering it into oblivion like it already has been.
These red engines are completely unforgiving if things are not done to exacting standard. HJere is what should have happened...
ref: http://rawze.com/forums/showthread.php?tid=8105&pid=70606#pid70606
anything less and its nothing but a waste of moneys and repeat of history.
Lol I get where you're coming from. This is one of our company trucks. The boss didn't really care about having to rebuild it twice. This was more or so a test to see if aftermarket kits were worth a shi#t, and if we'd be confident selling them to our customers...lesson learned.
RE: isx15 cm2350 pushing coolant - tree98 - 01-27-2025
So what did you find? Dropped liner?