I'm putting this post in General discussion because it's Kia Sedona related rather than Frontera - hope this is OK.
Having said that it may be of assistance to diesel engined motors.
Up to January of this year, my other run around motor was a Kia Sedona 2.9 diesel.
About a year ago it started having overheating problems by means of pressure building up back through the expansion tank which resulted in overheating. Advise from mechanic nephew was it could be an airlock in the system or blown head gasket. Didn't have any evidence of water and oil mixture or white smoke coming out of exhaust pipe and motor still pulled like a train. So last December I thought I'd try the cheap fix and have a go at air lock/blockage fix first. Happened to have some XL800 (the strongest gear you put in central heating systems for flushing out) so I gave that a try. Should have only left in the car coolant system for a day but because it was so cold at the time I left in the engine system for 5 days up to when the engine stopped running.
Symptoms where that when the engine went up to about 2500 revs it would judder about like a misfire on a petrol engine. Then it would cut out when stopping at junctions. Finally it cut out and would not restart. Towed the car home and emptied the coolant system. Only about 3 litres of coolant came out when it should have up to the 12 litre mark. Thinking I had done the engine big time I left it parked up outside the house until I could either have a go and fix it or tow to the scrappers and weigh it in. It's a 2001 Y reg. so debatable whether it's worth having money spent on it.
Any how a couple of weeks ago I decided I would have a go and dismantle to see if it had cracked cylinder head and/or cracks in the piston liners or bent any con-rods due to water being sucked into cylinders.
Now bearing in mind that Sedona's are heavy motors (nearly 2.7 tonne) there are some serious large bolts holding it together. Also the engine is transverse with the timing belt end of the engine tight up against the off-side inner wing. You have to take the front wheel off and work from under the wheel arch to get the drive and timing belts off.
The bottom drive belt pulley is held on by the large 38mm crankshaft bolt that as a torque setting of 200nm when its tightened up. I made up metal wedge to stop the bottom pulley from turning as I tried to undo the bolt but it wasn't having any of it. Tried putting a long bar and socket on a turning the engine on the key but even that didn't crack it undone. Phoned nephew and he told me that in the work place they would have had it up on a ramp and got a scaffold bar on the socket bar and got it off that way. This left me with a problem because I've got the car on axle stands and not a lot of clearance for a scaffold pole.
At this point I decided to go and see the independant garage proprietor who done the timing belt 3 years ago when I first got the car to see if he would undo the bolt for a cash job. Glad I did because he does not do a lot of work these days and wasn't interested in undoing my bolt. But he did have a chat with me and gave me some sound advise which is where I'm going to with this post.
He explained that a diesel engine was basically fuel and compression. No matter what, if you have got both the engine will run. He explained that before I dismantle the engine and have the expense of gaskets, bolts, tensioners etc rebuidling, eliminate the fuel issue first. I knew I had fuel feeding the pump and I had undone the fuel pipe after the pump and got diesel through. His advise was to undo the fuel pipes on top of the injectors one at a time, about half a turn and crank the engine. If all was OK, diesel should be sperting out of each indiviudal fuel pipe as undone. From there buy some 'Easy Start' and spray into the air intake and crank the engine. If the mechanics of the engine OK (i.e. cracked cylinder head, pistons etc.) the engine should run until the 'Easy Start' runs out. This in turn should indicate that the combustion side of the engine is working.
That was the theory and now the practice. Decided to go for the easy route first and sprayed 'Easy Start' into the air intake. After cranking the engine on the key couple of times, there was a slight knock and the engine burst into life.
Engine sounded normal so I left it running a couple of minutes without any 'Easy Start' assistance and it ran sweet as a nut. Had to be a bit careful as there is no coolant in the motor yet. Switched it off, left it a few minutes and then restarted with no problems at all.
Next move is to re-assemble the engine components (drive belt, radiator, intercooler rad etc.) and get a lick test done to see if the head gasket as got a problem between a water way and combusion chamber and go from there.
As can be imagined, from an engine that as not run from last January to burst into life 6 months later with a few sprays from a £4 can of 'Easy Start' I'm well pleased. As least I know at this point that I have not done any major damage. Still got a feeling that I'm going to have to do a head gasket at some point but will see what the lick test throws up.

















