mudhut
May 14th, 2005, 02:05 AM
Finally got head off. Pleased to say that the problem does not appear due to my having previously altered and then restored the carb fuel levels.
Here's the list.
Head gasket blown: between No. 1 and No. 2 (25mm chunk missing), between No. 2 and No. 3 (failed but not blown to pieces), between No. 3 and No. 4 (just showing signs of starting to fail).
Scoring in No. 2 bore (presumably the metal bits of gasket passed this way)
Water damage in bores: No1. 1 minor marks, No 2 similar, No 3 more extensiveand deeper of rusting - can be felt, No. 4 extensive but old water damage.
Head plug thread on No. 3 playing up again. Needs Timsert.
On the other hand, pistons are fine (have the flat topped variety with small recesses for valve edges). Not sure if these can be made to get to 10.5:1 CR as claimed by Oselli - anybody know?)
Head and piston surfaces very different across the engine - 1 is almost completely clean (understand water can do this - yes?), 2 is quite fouled, hard and dry, 3 and 4 look are soft and oily but the oil would have arrived during head removal anyway.
GC reckons I need to have block skimmed as well as head so apart from anything else, it's complete stripdown time. The head I could get away with cheaply but the water damage I really do not know how to deal with apart from rebore. This may put the whole job over £1000 with new pistons/rings/head bolts/good gasket and the head work if it is stripped and converted to unleaded/internal thermostat etc. etc. Quite apart from that the exact spec. of the head is unknown, esp the valve springs.
OTOH there may be a couple of whole engines on the horizon. I'd really like to get a complete one. Won't guarantee not to break it - after all the last one died shortly after doing what it was meant for...
IMO this engine has not been in the best state for some time and not really driven very hard at all. I didn't thrash it but it should have been able to more or less keep up with my boy's VX220. Perhaps all this and the very dodgy fuelling partly explains it,
Any observations anybody? I want my toy back.
Here's the list.
Head gasket blown: between No. 1 and No. 2 (25mm chunk missing), between No. 2 and No. 3 (failed but not blown to pieces), between No. 3 and No. 4 (just showing signs of starting to fail).
Scoring in No. 2 bore (presumably the metal bits of gasket passed this way)
Water damage in bores: No1. 1 minor marks, No 2 similar, No 3 more extensiveand deeper of rusting - can be felt, No. 4 extensive but old water damage.
Head plug thread on No. 3 playing up again. Needs Timsert.
On the other hand, pistons are fine (have the flat topped variety with small recesses for valve edges). Not sure if these can be made to get to 10.5:1 CR as claimed by Oselli - anybody know?)
Head and piston surfaces very different across the engine - 1 is almost completely clean (understand water can do this - yes?), 2 is quite fouled, hard and dry, 3 and 4 look are soft and oily but the oil would have arrived during head removal anyway.
GC reckons I need to have block skimmed as well as head so apart from anything else, it's complete stripdown time. The head I could get away with cheaply but the water damage I really do not know how to deal with apart from rebore. This may put the whole job over £1000 with new pistons/rings/head bolts/good gasket and the head work if it is stripped and converted to unleaded/internal thermostat etc. etc. Quite apart from that the exact spec. of the head is unknown, esp the valve springs.
OTOH there may be a couple of whole engines on the horizon. I'd really like to get a complete one. Won't guarantee not to break it - after all the last one died shortly after doing what it was meant for...
IMO this engine has not been in the best state for some time and not really driven very hard at all. I didn't thrash it but it should have been able to more or less keep up with my boy's VX220. Perhaps all this and the very dodgy fuelling partly explains it,
Any observations anybody? I want my toy back.