replace pistons

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Becks Bear

Becks Bear

Active Member
Posts
258
Location
Northern Ireland
Hi

is it possible to replace the pistons and shell bearings on a defender 300tdi engine with the engine in the landy:confused::confused:

i know i will have to remove the cylinder head, but can i remove the sump and get at the bottom end:confused::confused:

i hope the answer is yes:D:D:D
 
not possible to fit oversized pistons without reboring and the crankshaft has to removed to be ground to next undersize
 
biggles 85 said:
what symptoms does your engine have to point to a broken piston ring?
Click to expand...

heres the story

i am not near the landy at the minute away at work until next week

tried to get a mechanic to set the timing and fuel injection pump as the old girl was throwing out loads of white smoke.

my son in law tells me the white smoke is almost away, however when the mechanic drove the landy today he told SIL that it had no power, and that it COULD be worn pistons or tight or incorrectly set tappets:rolleyes::rolleyes: hes going to check the tappets tomorrow

all i am trying to do is figure out the best way I can fix it when i get home as i will be doing any work myself

hence the thinking about a full set of pistons and rings etc
 
Becks Bear said:
then do i just fit over sized piston rings:confused::confused:
Click to expand...
Hi Becks Bear.

Make enguiries about 'OIL CONTROL RINGS'.
I have used these on engines with worn bores and they have gone on for years, way beyond expectations.

Hope that helps.
Helps.
Howard.
2x300TdiDef.
 
Whether the bores are new or worn, they are a "SIZE", and so are the pistons. It's like having size seven shoes. Even when the soles are worn out, they are still size sevens.

The bore size and the piston size must "match".

So the possibilities are STANDARD (does we need to explain that size?), and then REBORED sizes, usually described as PLUS 010" 020" 030" in inch sizes. otr millimeter fractions such as PLUS .25 .50 ... and so on.

So if you rebore a cylinder you MUST fit a new piston of the same PLUS size as you increased the bore by. You must not try to fit oversixed pistons into a standard bore. They probably won't go in anyway.

I knew a guy many many years ago who reckoned he was smarter than the rest of us, and he rebored a 1275 cc Cooper S Mini all 4 bores Plus .020" twenty thou. To save money he used the original STD standard size pistons fitted with + 020" rings.

The VERY nasty noise was called piston slap. He put up with it for quite a while, but eventually he had to do the job properly.

It is very often the case especially with diesel engines, that simply glaze-busting the bores and fitting a new set of rings to the original pistons, and fitting a full crankshaft shells set, will give the engine a new lease of life for another 100,000 miles. Chances are it may go better than it did when it was new!

What I'm suggesting is we never should rush into rebores and new pistons too quickly.

CharlesY
 
CharlesY said:
Whether the bores are new or worn, they are a "SIZE", and so are the pistons. It's like having size seven shoes. Even when the soles are worn out, they are still size sevens.

The bore size and the piston size must "match".

So the possibilities are STANDARD (does we need to explain that size?), and then REBORED sizes, usually described as PLUS 010" 020" 030" in inch sizes. otr millimeter fractions such as PLUS .25 .50 ... and so on.

So if you rebore a cylinder you MUST fit a new piston of the same PLUS size as you increased the bore by. You must not try to fit oversixed pistons into a standard bore. They probably won't go in anyway.

I knew a guy many many years ago who reckoned he was smarter than the rest of us, and he rebored a 1275 cc Cooper S Mini all 4 bores Plus .020" twenty thou. To save money he used the original STD standard size pistons fitted with + 020" rings.

The VERY nasty noise was called piston slap. He put up with it for quite a while, but eventually he had to do the job properly.

It is very often the case especially with diesel engines, that simply glaze-busting the bores and fitting a new set of rings to the original pistons, and fitting a full crankshaft shells set, will give the engine a new lease of life for another 100,000 miles. Chances are it may go better than it did when it was new!

What I'm suggesting is we never should rush into rebores and new pistons too quickly.

CharlesY
Click to expand...
CharlesY
nice analogy about the shoe size lol lol :):):)

i know a bit about rebores and understand the need to fit larger pistons etc.

i think i will go for the fitting a new set of rings to the original pistons approach and fitting a full set of crankshaft shell bearings.

I suppose i need to buy these rings and shell bearings from a main stealer:confused:

again many thanks
 
Becks Bear said:
heres the story

i am not near the landy at the minute away at work until next week

tried to get a mechanic to set the timing and fuel injection pump as the old girl was throwing out loads of white smoke.

my son in law tells me the white smoke is almost away, however when the mechanic drove the landy today he told SIL that it had no power, and that it COULD be worn pistons or tight or incorrectly set tappets:rolleyes::rolleyes: hes going to check the tappets tomorrow

all i am trying to do is figure out the best way I can fix it when i get home as i will be doing any work myself

hence the thinking about a full set of pistons and rings etc
Click to expand...
white smoke is usually unburnt diesel being expelled, now because diesel requires high compression to make it burn it does sound as though a set of rings and a de glaze of the bores are in order, whilst you have the head off remove the valves and re seat them, just has similair myself but it turned out to be a bent con rod
 
biggles 85 said:
white smoke is usually unburnt diesel being expelled, now because diesel requires high compression to make it burn it does sound as though a set of rings and a de glaze of the bores are in order, whilst you have the head off remove the valves and re seat them, just has similair myself but it turned out to be a bent con rod
Click to expand...

white smoke was the 1st problem and with help on here i got to the bottom of it and have stopped the white smoke i think:eek::eek:
 
Becks Bear said:
CharlesY
nice analogy about the shoe size lol lol :):):)

i know a bit about rebores and understand the need to fit larger pistons etc.

i think i will go for the fitting a new set of rings to the original pistons approach and fitting a full set of crankshaft shell bearings.

I suppose i need to buy these rings and shell bearings from a main stealer:confused:

again many thanks
Click to expand...
no need to buy from a stealer, your local Indy will be able to get them for you at a more reasonable price - or mail order
 
Becks Bear said:
CharlesY
nice analogy about the shoe size lol lol :):):)

i know a bit about rebores and understand the need to fit larger pistons etc.

i think i will go for the fitting a new set of rings to the original pistons approach and fitting a full set of crankshaft shell bearings.

I suppose i need to buy these rings and shell bearings from a main stealer:confused:

again many thanks
Click to expand...

Way to go.
Unless the bores and pistons were really wrecked that's what I would be doing.

Be sure to bust the glaze on the bores properly, and watch out for the rings ridge at the tops of the bores - get "Ridge-Dodger" top compression rings and all will be well. If you don't bust the glaze the oil consumption may be high, and the engine may have a blue smoky exhaust. This happens when the "oil scraper" piston rings skid over the oil layer which then gets up into the combustion chamber. If the bores are lightly glaze-busted it won't happen. The new rings will "bed in" to the glaze-busted bores, but may never 'bed in' to shining glazed bores.

Who are the best people these days for rings and shells? It used to be "Pistons & Components" but our local one of those has closed down.

CharlesY
 
CharlesY said:
Way to go.
Unless the bores and pistons were really wrecked that's what I would be doing.

Be sure to bust the glaze on the bores properly, and watch out for the rings ridge at the tops of the bores - get "Ridge-Dodger" top compression rings and all will be well. If you don't bust the glaze the oil consumption may be high, and the engine may have a blue smoky exhaust. This happens when the "oil scraper" piston rings skid over the oil layer which then gets up into the combustion chamber. If the bores are lightly glaze-busted it won't happen. The new rings will "bed in" to the glaze-busted bores, but may never 'bed in' to shining glazed bores.

Who are the best people these days for rings and shells? It used to be "Pistons & Components" but our local one of those has closed down.

CharlesY
Click to expand...

aye so has the one on gt western road glasgow
 
just make sure you use quality branded shells and rings like vandervell etc. allmakes do shells but i wouldnt use them. Not sure what paddocks will sell you but you can enquire and they should be aroud £40 for rings and £50 or less for both sets of shells. They were last time I bought them for a Tdi anyway!
 
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