My Nissan Undergoing Engine Work

After a long long time, yesterday my car refused to gain speed yes m talking about my nissan sunny 85-86 1000 CC DX 1.0 Japanese model...Have this car since August 1985.Never thought of selling it out as it was the 2nd car my father bought in start of his career and he has sum special affection wid this car.though we changed many cars but this one is wid us since 85 the other TOYOTA PUBLICA is also here but in very very bad condition ...Sunny is 167700km driven...AC and CNG installed...driven more than 85000km on CNG (sorry anti-cng gang ) very roughly used after 2001 wen our new car got snatched and my father refused to buy any expensive car in future ...

Anyhow on thursday i noticed some jerks and noises from the engine...soon after it refused to gain speed...i took the car to diff mechanics...everyone suggested to get it overhauled as the engine is not building pressure...i was expecting it as it was consuming almost 3 litres of oil in month but i was delaying it till december as the weather gets comfortable...after converting it to petrol,yesterday, i drove more than 120km...i was shocked that it was giving only 6km/litre

so yesterday i took the car to my mechanic ( AUTO ROOTS-Defence Road-LHR). He too suggested to get it overhaul as he also advised me sumtime back to get it overhauled soon. The engine was disassembled and following parts are to be changed :

1. Piston set 0.50
2. Ring Set 0.50
3. Main DB set 0.25
4. Came Bush set
5. Valve Set
6. Guide Set (sorry for spellings)
7. Oil Pump
8. Water Pump
9. Timming Belt
10. T. Bearing.
11. Carboureter Kit.
12. Front Axle Boot
13. Jain Kit

Bought all the things from Abid Auto montgomery road.engine is given for overhauling in Nila Gunbad ( Times Auto)..mechanic/kharadia will take one day for the overhauling work.