The Cylinder Heads

Mr. Wilson - What about the cylinder heads? Do the contract surfaces of the cylinder heads require machining or just scraping?

Ch. Eng. - They need both.

Mr. Wilson - Must all .the cylinder head be renewed or can some of them be repaired?

Ch.Eng. - Well, the. starting valves are to be overhauled with later pressure testing. But all the other' fittings ( the safety valves, the indicating cocks, etc) should be renewed.

Mr. Wilson - Very well. According to the list of repairs you'd like to replace only four exhaust valves. Why not all of them?

Ch.Eng. - The other exhaust valves are O.K. But their disks and stems should be turned.

Mr. Wilson - Do you think that all exhaust valve rockers and rods should be replaced too?

Ch.Eng. - No,-I don't think so. But the rocker bronze bushes and pins should be renewed.

Mr. Wilson-Well, I see.

THE CYLINDER AND PISTON ASSEMBLY II

Notes:

piston	поршень
repair size	ремонт, размер
plasma - jet hard facing	плазменная наплавка
piston pin	поршневой палец
pressure test	опрессовка
groove	канавка
main bearing	рамовый подшипник
ring	кольцо
top-end bearing	головной подшипник
renewal	замена
measure	измерять
bottom-end bearing	мотылевый подшипник
adjust	регулировать
measurement	измерение
clearance	зазор
adjustment	регулировка
to rebabbit	перезалить
babbit = white metal = antifrictional metal	заливка подшипника
to bore	растачивать
boring	расточка

- Mr. Wilson - Well, let's pass on to the piston. Can you tell me. What should be done about them?

Ch. Eng. - according, to the list of repairs two piston assemblies are to be replaced. The rest require the following repairs, namely:

- plasma jet hard facing and cutting the grooves for the piston rings;

- renewal of the piston rings on all the piston;

- measuring the clearances in the top-end bearings. If required they should be rebabbited and then fitted into position with necessary clearances.

Mr. Wilson - I see. By .the way do you want the top end bearings to be rebabbited and adjusted to the new repair sizes of the piston pins or to the old ones?

Ch. Eng. - To the old ones. The pistons will require the pressure testing.

Mr. Wilson - What arc you plans about the piston telescopic system?

Ch. Eng. - Unfortunately it should be completely replaced.

Mr. Wilson - And what about the main bearings?

Ch. Engineer - The main bearings which have big cracks in babbit should be remetalled and then fitted into position. The other bearings should be used depending on their conditions and clearances.

Mr. Wilson - Shall we repair the bottom - end bearings according to the list of repairs?

Ch.Eng. - Oh, yes. Rebabbiting, boring, scraping, fitting and all that I'm sure you know what should be done.

Mr. Wilson - Well, we'll try to do our best.

Exercise 8. Придумайте ответные реплики:

A: Do the contact surfaces of the cylinder heads require machining or just scraping?

B: ......................

A: What are you planning to do with the starting valves ?

B: ......................

A: What valves should be replaced?

B: ......................

A: What are your plans about the piston telescopic system?

B: ......................

A: And what about the main bearings?

B: ......................

A: Shall we repair the bottom end bearing according to the list of repairs?

B: ......................

A: How many cylinder liners should be replaced?

B: ......................

Exercise 9. Translate the sentences.

1. Объясните, что главному двигателю необходим кап. Ремонт. Вся дополнительная работа по демонтажу и сборке главного двигателя включена в ремонтную ведомость. Телефоны, датчики и индикаторы будут сняты силами машинной команды.

2. Объясните, что крышки цилиндров требуют машинной чистки и шабровки. Вся их арматура, кроме выхлопных клапанов должна быть заменена. Трещины надо вырубить и перезаварить. Диски и штоки выхлопных клапанов должны быть проточены.

3. Объясните, что вы хотите заменить 2 поршня в сборе и отремонтировать остальные. Объясните, какой ремонт им необходим. Мотылевые подшипники должны быть перезалиты, проточены, отшаброваны и установлены по месту.

4. Объясните что головка одного из поршней прогорела.

5. Скажите, какой ремонт необходимо сделать. На поршне цилиндра №2 кольца защемлены в канавках. Замерьте, зазоры и прорубите канавки точно по размеру. На поршне цилиндра №3 большие отложения накипи, которые необходимо удалить.