Replacing cilinderhead Thornycroft T90

[Dutchie]

Replacing cil head thornycroft T90

 

Why , last year the engine had bad cold starts , i found that 2 glowplugtips had broken tips and 1 a broken heater element , time for replacement.!

 

thornycroft ID plate

 

 

rockerarms and pushrods

 

 

ready for lift off

 

head removed , a test of the valves with petrol after cleaning says that 7 valves where leaking

one broken tip off the glowplugs removed with this 4 mm diam. tool , i tick it 10 mm. into the burning chamber

then give a few ticks with a hammer to put the tip down via the fuelinjector hole (i think the length off the broken tip was too long for the burning chamber)

there he is ...

A local revise workshop did the job, valves where ok,. and valve guide where in good condition they told me

new headgasket after cleaning the top off the block

repainted in thornycroft blue , also after testing the fuel injectors there opening pressure was stil 135 bar after 10 years , in 2004 i changed the nozzles for new bosch ones .

back on the engine , got some unf nuts from a local motorbikedealer , the nuts off the exhaust manifold where not so good anymore , its really difficiult to find nuts and bolts with this thread,here in Nl .also the exhaust manifold was repainted , new gaskets for the pipe from the exhaust cooler too the cil.head are made by myself from oldseacharttpaper,

rockersarms back on the head

but before i got also the 3 headnut problem , i had no crowfoot

i did it on an alternative way

i turn the rockerarms and shaft 180deg, and mount it only with the 4 headnuts (the exhaust cooler was not mounted ) , on this way it was possible too torque all the nuts on the right way

after torque it at 10 kgf. , after this i remove the 4 nuts off the rockerarms and shaft and remove it and put it back, turn this one 180 deg. and mount and torque again the 4 headnuts .

check and made the right valve clearences ,

fill up antifreeze and water and check all hoses for leakages

then bleeding the DPA fuel pump and injectors .

and give it a try too start with a full big battery after 30 seconds glowing ,it came back to live , after a minute it was really running as a young lady

a testtrip was good for bleeding the coolwatersystem and i found two little leakages one at a coolwater hose and a fuelinjector pipe nut , after retorque this the problem was over .

i start the engine after a week after a very cold night it starts after 10 sec. glowing real quickly and is running very nice without any smoke , i,m happy

all the best and Merry X mas too all from Vincent from the netherlands

 

PS. after how many hours i need retorque the headnuts ? (the local workshop told me that i can pick up a crowfoot for the famous three nuts under the rockershaft)

 

Edited December 10, 2014 by Dutchie

[bigste]

So why not go the whole hog and paint the rocker cover? Very good thread as well. I mean the content not the unf. lol

[Dutchie]

So why not go the whole hog and paint the rocker cover? Very good thread as well. I mean the content not the unf. lol

 

The cover is Chromed from factory in these days by Thornycroft , its was really in excellent condition after cleaning

Edited December 11, 2014 by Dutchie