Thread: Head removed now what? 300tdi

Have you checked the radiator and the viscus fan hub?

you may also get bad over heating if the impeller on the water pump has been eroded away (unlikely unless you've had abrasives of some sort get into the cooling system) or the impeller has come off of the shaft (didnt think it could happen myself until I saw it first hand)

in some cases if the 3 way bleeder (vactuator) that makes the junction of the expansion tank, radiator and the thermostat housing is stuffed it can effectively drain the thermostat housing leaving you with very poor coolant flow. this causes overheating.

I read somewhere that you shouldn't run a 300tdi with no thermostat as the back of the head will be drained of coolant causing overheating. Don't know for sure that it's a fact, but I'd be cautious.
Don.

Originally Posted by Blknight.aus

Have you checked the radiator and the viscus fan hub?

you may also get bad over heating if the impeller on the water pump has been eroded away (unlikely unless you've had abrasives of some sort get into the cooling system) or the impeller has come off of the shaft (didnt think it could happen myself until I saw it first hand)

in some cases if the 3 way bleeder (vactuator) that makes the junction of the expansion tank, radiator and the thermostat housing is stuffed it can effectively drain the thermostat housing leaving you with very poor coolant flow. this causes overheating.

Checking the waterpump is on my todo list tomorrow rqdiator has recently been flushed out and was running fine but thinking its got to the stage of taking it to natrad and getting them to give it a look.
Where can I find more information on this 3way bleeder (Im guessing your talking about that little hose going from top of thermostat housing to expansion tank)

Originally Posted by Don 130

I read somewhere that you shouldn't run a 300tdi with no thermostat as the back of the head will be drained of coolant causing overheating. Don't know for sure that it's a fact, but I'd be cautious.
Don.

Not something I regularly do was just seeing if it was the issue or not.



So this overheating issue came from a blown top radiator hose which I thought may have been from cooling system over pressurising from a blown head gasket. I patched it up to get home though it wasn't the best repair job it got me home as long as I didnt switch car off as then it would just dump coolant everywhere (throught the dodgy repair job to get home) but while engine was running or even idling it retained coolant.

I have noticed lately quite abit of pressure building up in my cooling system maybe thats due to the new expansion tank cap but Im sure its over 15psi

Since you have gone to the trouble of taking the head off, you could get it tested. An engine repair shop should be able to crack test the head. If its ok they can tidy it up for you

Last time I had that done (quite a few years ago) on a 300Tdi it cost about $50. It was bad news with bypass from the coolant gallery into the two centre exhaust ports. Needed a new head. Mine was loosing coolant however

Post up some close pics of the head, if its cracked they will be fine cracks around the glow plug holes and valves.
What was the condition of the gasket ?

Manifold gasket was obviously stuffed as lots of black carbon around cylinders 2-3 probably not helped by the fact the bottom stud was missing.
Head gasket seems pretty good though missing a few patches now where it had stuck to the block or head and slightly bent from removal.
A couple of small cracks have been found around the glowplugs of cylinder 2 & 3 they are only quite small but I guess that signals a dead head.
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This plug here I am guessing is for the stock temperature gauge wasn't aware it was there and snapped it last night.
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Im guessing this is the part?

So with installing a new head what else do people recommend be replaced the obvious is gaskets but Im also thinking manifold studs as mine not the best of shape plus ones missing new glowplugs while the head is off as getting out that 1st glowplug once installed is a real pain. Maybe even injectors but I don't think I can stretch the budget that far at the moment.

You should routinely replace the head bolts with new.

Originally Posted by Grappler

You should routinely replace the head bolts with new.

New bolts are supplied with the head so will be using those.

Is it worth replacing things like push rods, crankcase breather, rocker arms, rocker shaft just trying to work it all out before ordering since its coming from the UK