Vehicle & Technical > Defender
0 milage engine rebuild - whats involved
TDi90:
thats interesting!
all the cars i have worked on in the workshop were stretchy bolts :-o
lots of things on landys are weird compared to cars!
Rob
Tinks:
Most cars are, i'd say in every 10 cars we get in 1 of them wont be stretch bolts.
Forgot to say aswell when you get the head skimmed if they have to take a fair bit off it make sure they reseat the valves otherwise they'll hit the top of the pistons. :roll:
We got a cylinder head skimmed once and the chap that did the machining work said it was pretty bad and they'd taken quite alot off it and when i asked if he had reseated the valves he asked me "why would you need to do that?" :shock: :shock: Needles to say havent taken anything back there again!!
Range Rover Blues:
--- Quote from: Tinks on March 08, 2008, 17:07:04 ---200tdi head bolts are not stretch bolts, if they stretched then you could not reuse them at all!
Stretch bolts can not be used twice, once you take them out you chuck them away and get new ones. :P
--- End quote ---
Not true I'm afriad.
On my Cavalier 1.7D they were use-once
On the Transit they are use 3 times
On the 300TDi they are use 5 times
As a rough guide if the torquing sequence uses angle torquing then the bolts are stretching, there is no other means of measuring or limiting the load they are applying then their own yeild strength.
Tinks:
Well whatever. Either which way all i'm trying to say is that when he rebuilds his engine he wont need to get new head bolts.
Unless of course he knows that someone has already had the cylinder head off it a number of times in which cas i'd personally not bother spending much more than a fiver on it! :D :D
Range Rover Blues:
Absolutley. As a "good practice" the bolts should be stamped with a centre punch every time they are re-used. I don't think it's coincidence that they have 5 stars on the top face of the head either :-k
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