105 Engine Rebuild Question - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 8 (permalink) Old 05-17-2018, 04:58 PM Thread Starter
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105 Engine Rebuild Question

I am soon to be rebuilding a 1964 105 Guilia Spider motor with 120K miles. The engine is out of the car. Maintenance history is unknown other than that the oil and filter were changed on a regular basis. The owner says that the car ran well, did not smoke, but could not remember what the oil pressure was while running. Assuming a compression check yields good numbers, and no other issues arise once the head is removed, is a valve job all that needs doing? What about timing chains, water pump? Plan to replace main crank seals. Or, with that many miles and no history, should the bottom end be disassembled, measured and new bearings installed? Any suggestions/advice/questions much appreciated. Thanks.

Pat
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post #2 of 8 (permalink) Old 05-17-2018, 07:26 PM
I would say that with 120k miles on it, the motor deserves some love. Main and rod bearings are cheap. Rings as well. Might want to think about rebuilding/replacing the oil pump. Replace the water pump. Check the ring gear wear on the flywheel...

As an aside, you should rebuild the steering box - easy to do with the motor out.

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post #3 of 8 (permalink) Old 05-18-2018, 08:03 AM Thread Starter
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Thanks, gprocket. Appreciate your time.
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post #4 of 8 (permalink) Old 05-18-2018, 08:13 AM
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Lower timing chain, always always replace. They wear, stretch, and you can't get to them once the engine's assembled. Yeah, at that mileage I'd presume to do all the wear parts as a matter of course. If the engine's been sitting, water pump is probably toast. Measure and inspect the crank, or if you're not qualified have someone do it. Probably needs grinding or at least polishing, but if it's OK as is, you don't want to cut needlessly. Flywheel, don't surface unless it needs it.

Head will need inspecting and probably some work. There are a lot of fiddly details specific to an Alfa (liner seating, e.g.), just like any engine. Having someone around who knows them can be a big help.

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post #5 of 8 (permalink) Old 05-18-2018, 10:52 AM Thread Starter
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Thanks, Andrew. One other question. It's been eleven years or so since I've removed a crankshaft pulley. Are the threads rightsy-tightsy/leftsy-loosy, or the other way round. Bone head question, I know, but I just don't remember (must be an age thing).
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post #6 of 8 (permalink) Old 05-18-2018, 11:16 AM
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Normal threads. Might be a lock tab, might be Loctite, might be very tight.
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post #7 of 8 (permalink) Old 05-18-2018, 12:22 PM
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I would remove the plugs from the crank and give it a proper cleaning.
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post #8 of 8 (permalink) Old 05-18-2018, 01:51 PM Thread Starter
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Thanks all. Appreciate the info and suggestions. I am actually looking forward to this!
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