They all crack between the valves- and it never causes any problems.
The crack is superficial and doesn't ever extend far into the head.
Some people weld them up, but there's no benefit to it. I've owned
several- and none were any noiser than an OM60x engine. If the turbo
is noisy, it was probably damaged somehow.
There's a lot of myths about these, but they really don't have any
major design problems that affect longevity. They are durable and last
a very long time if properly cared for. Most come off the road from
losing compression due to using the wrong oil (needs a diesel rated
synthetic), and from blowing the headgasket after overheating (nobody
ever replaces the coolant hoses- and they don't have a level sensor).
The coolant hoses are expensive and hard to source, they need regular
timing belt changes, and they require a lot of expensive special tools
for regular work.
Sincerely,
Tyler
1987 190D Turbo Biodiesel
On Jan 19, 2010, at 6:57 PM, Peter Frederick wrote:
Actually, they tend to crack badly between the valves, causing the
valve guides to come loose.
However, unlike MB heads, they can be welded, a friend had his done
and it ran great. Noisy bastards, though -- turbo sounds like a cop
siren a couple blocks back!
Peter
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