1990f2507.3
Registered User
As for overheating no one can answer it but I have heard that timing can cause it to create excessive heat and I don't see paying to have it timed without new injectors first
High altitude motors had a fuel spec change, but no other changes. If you post the block serial numbers I can tell you everything you need to know about the engine. Unless you pulled this engine out of a boat in the junkyard, it’s exactly the same as every other idi out there. You still haven’t answered where the injectors came from. Crap injectors will **** fuel into the precups instead of giving a proper atomization. This will give poor power, poor fuel economy, and you will have to work the engine so hard to achieve the same task it will easily overheat.
the injectors came from us diesel/ gomers diesel. untill this injection pump problem. i have never had a problem with there injectors and pumps. but as i said above they lost my new injectors. and no clear answer or refund given. i know 1 injector is acting up and has been for a while, i wsnt sure if new pump would solve it so its getting a old spare working injector till new ones come. but they have 55k hard miles on them and hundreds of hours idling. i idle the engine 2 to 6 hours every day year round as i work off of truck.
How are you checking tdc? It’s possible your method is inaccurate, you can’t find tdc like a gas engine or a DI diesel since you don’t have direct access to the piston through the head.
With the timing marks lined up you will have 1 and 4 at tdc. 1 will be at compression and 4 will be on the exhaust, but that doesn’t matter for the time being. Pull the inspection cover off the timing cover with #1 at tdc. If everything is lined up properly the dowel on the timing gear should be at #4. If not, the cam or pump gear is has been installed a tooth off.
theres no telling whats been done over the years. i know someone messed with pump gear as housing had fresh silicoln seal when the motor was dropped in truck. old pump was adavnced just over 1/4 inch. always ran 160 to 180 loaded and idling would drop to 130. right now its running ok but will keep trying to find a way to reset timing to new pump.
If you have to give it a shot of ether to fire cold then your glow plugs aren’t working or you have no compression left in the engine.
my best guess is this engine has 350k miles or more almost all original factory parts. so its over due. heads started leaking this year an i re torqued the bolts and everything sealed back up. half the bolts where at 60 pounds or less some loose. valve springs where worn and not closing so changed them out even thouh 4 where bad. this engine is getting weak and i know that. its time for it to get rebuilt. i have built engines not sure if i want to tackle this one but finding anyone willing to build that has relevant experience is near impossible. most shops want to drop a crate motor in, that use the cheapest parts. i rather build things right, stronger an better. i got a lead on 2 crate 6.9 in a warehouse since mid 80's at a good price and trying to deicde if that a better option this winter. then rebuilding.
anyways good chat, have a good afternoon .
“Test” engines wouldn’t have a serial number, and wouldn’t ever be released for on road use. International didn’t go bankrupt and bury any projects, this era was the golden age of international, they were dominating the market with the dt466s and 7.3s...
You said your performance and fuel economy changed when you installed the injectors and pump. That’s the problem.